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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Valuation and Qualifying Accounts      
Balance at beginning of period $ 123 $ 100 $ 98
Additions Charged to Costs and Expenses 94 51 37
Deductions 26 28 35
Balance at end of period 191 123 100
Valuation allowance for deferred tax assets      
Valuation and Qualifying Accounts      
Balance at beginning of period 90 73 69
Additions Charged to Costs and Expenses 69 30 19
Deductions 6 13 15
Balance at end of period 153 90 73
Allowance for obsolete inventory parts      
Valuation and Qualifying Accounts      
Balance at beginning of period 29 24 27
Additions Charged to Costs and Expenses 6 5 4
Deductions 0 0 7
Balance at end of period 35 29 24
Allowance for doubtful accounts      
Valuation and Qualifying Accounts      
Balance at beginning of period 4 3 2
Additions Charged to Costs and Expenses 19 16 14
Deductions 20 15 13
Balance at end of period $ 3 $ 4 $ 3