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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unrecognized tax benefits:      
Balance, January 1 $ 190 $ 214 $ 201
Increases as a result of tax positions taken during the current year 14 14 13
Decreases of tax positions taken during prior years (21) (37) (9)
Increases of tax positions taken during prior years 20 9 15
Decreases as a result of settlements with taxing authorities and the expiration of statutes of limitations (30) (6) (15)
Effect of foreign currency rate movements 0 (4) 9
Balance, December 31 $ 173 $ 190 $ 214