Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Details)

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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
Current expected credit losses on receivables and contract assets[Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 7 $ 0 $ 30
Charged to cost and expenses 2 7 16
Charged to other accounts 0 0 0
Deductions 0 0 (46)
Balance at end of period 9 7 0
Deferred tax asset valuation allowance [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 190 196 686
Charged to cost and expenses (127) (6) (490)
Charged to other accounts 0 0 0
Deductions 0 0 0
Balance at end of period $ 63 $ 190 $ 196