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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Valuation and Qualifying Accounts      
Balance at beginning of period $ 98 $ 54 $ 40
Additions Charged to Costs and Expenses 37 49 20
Deductions 35 5 6
Balance at end of period 100 98 54
Valuation allowance for deferred tax assets      
Valuation and Qualifying Accounts      
Balance at beginning of period 69 31 21
Additions Charged to Costs and Expenses 19 38 10
Deductions 15 0 0
Balance at end of period 73 69 31
Allowance for obsolete inventory parts      
Valuation and Qualifying Accounts      
Balance at beginning of period 27 22 18
Additions Charged to Costs and Expenses 4 5 4
Deductions 7 0 0
Balance at end of period 24 27 22
Allowance for doubtful accounts      
Valuation and Qualifying Accounts      
Balance at beginning of period 2 1 1
Additions Charged to Costs and Expenses 14 6 6
Deductions 13 5 6
Balance at end of period $ 3 $ 2 $ 1