v3.6.0.2
Valuation and Qualifying Accounts and Reserves (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 28 $ 45 $ 53
Additions, Charged to Costs and Expenses 0 0 0
Additions, Charged to Other Accounts 0 0 0
Deductions, Charged to Costs and Expenses 0 11 0
Deductions, Charged to Other Accounts 3 6 8
Balance at End of Period 25 28 45
Allowance for related party doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 254 218 0
Additions, Charged to Costs and Expenses 0 74 0
Additions, Charged to Other Accounts 11 0 218
Deductions, Charged to Costs and Expenses 0 0 0
Deductions, Charged to Other Accounts 0 38 0
Balance at End of Period 265 254 218
Investments and long-term receivables reserve      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 7 8 10
Additions, Charged to Costs and Expenses 0 0 0
Additions, Charged to Other Accounts 3 0 0
Deductions, Charged to Costs and Expenses 0 0 0
Deductions, Charged to Other Accounts 0 1 2
Balance at End of Period 10 7 8
Long-term receivables from related parties reserve      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 1,446 1,188 0
Additions, Charged to Costs and Expenses 0 465 0
Additions, Charged to Other Accounts 181 0 1,188
Deductions, Charged to Costs and Expenses 0 0 0
Deductions, Charged to Other Accounts 0 207 0
Balance at End of Period 1,627 1,446 1,188
Domestic deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 804    
Additions, Charged to Costs and Expenses 174    
Additions, Charged to Other Accounts 131    
Deductions, Charged to Costs and Expenses 0    
Deductions, Charged to Other Accounts 0    
Balance at End of Period 1,109 804  
Foreign deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 4 5 1,028
Additions, Charged to Costs and Expenses 0 0 0
Additions, Charged to Other Accounts 0 0 0
Deductions, Charged to Costs and Expenses 0 1 0
Deductions, Charged to Other Accounts 0 0 1,023
Balance at End of Period 4 4 5
State deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 804 0  
Additions, Charged to Costs and Expenses   753  
Additions, Charged to Other Accounts   51  
Deductions, Charged to Costs and Expenses   0  
Deductions, Charged to Other Accounts   0  
Balance at End of Period   $ 804 $ 0