v3.10.0.1
FINANCIAL INSTRUMENTS - Scheduled Debt Repayments (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 02, 2013
Apr. 03, 2012
Sep. 30, 2008
Disclosure of detailed information about borrowings [line items]            
Borrowings $ 5,738,000,000 $ 6,423,000,000 $ 7,931,000,000      
Minimum annual payments under capital leases 20,000,000          
Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 598,000,000 603,000,000 609,000,000      
Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 43,000,000 $ 71,000,000 $ 99,000,000      
2019            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 11,000,000          
2020            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 4,000,000          
2021            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 1,000,000          
2022            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 1,000,000          
2023            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 1,000,000          
2024 and thereafter            
Disclosure of detailed information about borrowings [line items]            
Minimum annual payments under capital leases 2,000,000          
Gross amount            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,747,000,000          
Gross amount | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 248,000,000          
Gross amount | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 7,000,000          
Gross amount | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 337,000,000       $ 1,250,000,000  
Gross amount | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 6,000,000          
Gross amount | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,000,000          
Gross amount | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 32,000,000          
Gross amount | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 15,000,000          
Gross amount | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 300,000,000          
Gross amount | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 600,000,000          
Gross amount | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 250,000,000         $ 250,000,000
Gross amount | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 750,000,000       $ 750,000,000  
Gross amount | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000     $ 850,000,000    
Gross amount | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,000,000          
Gross amount | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 42,000,000          
Gross amount | 2019            
Disclosure of detailed information about borrowings [line items]            
Borrowings 32,000,000          
Gross amount | 2019 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2019 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 4,000,000          
Gross amount | 2019 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 28,000,000          
Gross amount | 2020            
Disclosure of detailed information about borrowings [line items]            
Borrowings 263,000,000          
Gross amount | 2020 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 248,000,000          
Gross amount | 2020 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2020 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 1,000,000          
Gross amount | 2020 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 14,000,000          
Gross amount | 2021            
Disclosure of detailed information about borrowings [line items]            
Borrowings 7,000,000          
Gross amount | 2021 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 7,000,000          
Gross amount | 2021 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2021 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022            
Disclosure of detailed information about borrowings [line items]            
Borrowings 337,000,000          
Gross amount | 2022 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 337,000,000          
Gross amount | 2022 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2022 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2023 | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2024 and thereafter            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,108,000,000          
Gross amount | 2024 and thereafter | 4.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2024 and thereafter | 7.31% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2024 and thereafter | 3.85% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2024 and thereafter | 7.73% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 6,000,000          
Gross amount | 2024 and thereafter | 7.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 5,000,000          
Gross amount | 2024 and thereafter | 7.37% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 32,000,000          
Gross amount | 2024 and thereafter | 8.05% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 15,000,000          
Gross amount | 2024 and thereafter | 6.38% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 2024 and thereafter | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 2024 and thereafter | 5.80% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 200,000,000          
Gross amount | 2024 and thereafter | 6.45% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 300,000,000          
Gross amount | 2024 and thereafter | 6.35% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 600,000,000          
Gross amount | 2024 and thereafter | 7.50% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 250,000,000          
Gross amount | 2024 and thereafter | 5.95% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 2024 and thereafter | 5.70% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 2024 and thereafter | 5.25% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 750,000,000          
Gross amount | 2024 and thereafter | 5.75% notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings 850,000,000          
Gross amount | 2024 and thereafter | Other debt obligations            
Disclosure of detailed information about borrowings [line items]            
Borrowings 0          
Gross amount | 2024 and thereafter | Acacia credit facility            
Disclosure of detailed information about borrowings [line items]            
Borrowings $ 0