Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net	[1]	$ 2	$ (67)	$ (47)	$ (127)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		(5)	18	(11)	3
Foreign Currency Transaction (Loss) Gain After Tax		(3)	(49)	(58)	(124)
Subsidiary Monetary Position
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net		(32)	(61)	(47)	(300)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		3	16	(11)	44
Foreign Currency Transaction (Loss) Gain After Tax		(29)	(45)	(58)	(256)
Hedging Program [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net		34	(6)	0	173
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		(8)	2	0	(41)
Foreign Currency Transaction (Loss) Gain After Tax		$ 26	$ (4)	$ 0	$ 132

[1] Includes net pre-tax exchange losses of $(16) million and $(53) million associated with the devaluation of the Argentine peso for the three and nine months ended September 30, 2021, respectively, and $(26) million and $(56) million for the three and nine months ended September 30, 2020, respectively.