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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unrecognized tax benefits:      
Balance, January 1 $ 214 $ 201 $ 186
Increases as a result of tax positions taken during the current year 14 13 9
Decreases of tax positions taken during prior years (37) (9) (45)
Increases of tax positions taken during prior years 9 15 71
Decreases as a result of settlements with taxing authorities and the expiration of statutes of limitations (6) (15) (18)
Effect of foreign currency rate movements (4) 9 (2)
Balance, December 31 $ 190 $ 214 $ 201