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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unrecognized tax benefits:      
Balance, January 1 $ 173 $ 190 $ 214
Increases as a result of tax positions taken during the current year 18 14 14
Decreases of tax positions taken during prior years (5) (21) (37)
Increases of tax positions taken during prior years 57 20 9
Decreases as a result of settlements with taxing authorities and the expiration of statutes of limitations (19) (30) (6)
Effect of foreign currency rate movements 3 0 (4)
Balance, December 31 $ 227 $ 173 $ 190