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Income and Other Taxes - Unrecognized Tax Benefits Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance, Beginning $ 127 $ 108 $ 125
Additions related to current year 3 42 2
Additions related to prior years positions 8 17 3
Reductions related to prior years positions (10) (36) (13)
Settlements with taxing authorities (8) (1) (6)
Reductions related to lapse of statute of limitations (7) (3) (3)
Currency 2 0 0
Balance, Ending 115 127 108
Tax positions, highly certain of realizability but with uncertainty of timing 8 3 8
Accruals for payment of interest and penalties $ 4 $ 2 $ 2