Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net	[1]	$ (35)	$ (61)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		(5)	(17)
Foreign Currency Transaction (Loss) Gain After Tax		(40)	(78)
Subsidiary Monetary Position
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net		(51)	(226)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		(1)	23
Foreign Currency Transaction (Loss) Gain After Tax		(52)	(203)
Hedging Program [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net		16	165
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		(4)	(40)
Foreign Currency Transaction (Loss) Gain After Tax		$ 12	$ 125

[1] Includes net pre-tax exchange losses of $(23) million and $(9) million associated with the devaluation of the Argentine peso for the three months ended March 31, 2021 and 2020, respectively.