Supplementary Information Foreign Currency Exchange Gain (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net	[1]	$ (67)	$ (11)	$ (127)	$ (70)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		18	(12)	3	0
Foreign Currency Transaction (Loss) Gain After Tax		(49)	(23)	(124)	(70)
Subsidiary Monetary Position
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net	[1]	(61)	(66)	(300)	(59)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		16	1	44	(2)
Foreign Currency Transaction (Loss) Gain After Tax		(45)	(65)	(256)	(61)
Hedging Program [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net		(6)	55	173	(11)
Foreign Currency Transaction (Loss) Gain Tax (Expense) Benefit		2	(13)	(41)	2
Foreign Currency Transaction (Loss) Gain After Tax		(4)	42	132	(9)
Hedging Program [Member] | Argentine Peso Devaluation [Member]
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net		$ (26)	$ (33)	$ (56)	(42)
Hedging Program [Member] | Argentine Peso Devaluation [Member] | Corporate
Foreign Currency Exchange Gain (Loss) [Line Items]
Pre-tax exchange (losses) gains - net					$ 33

[1] Includes net pre-tax exchange losses of $(26) million and $(56) million for the three and nine months ended September 30, 2020, respectively, and $(33) million and $(42) million for the three and nine months ended September 30, 2019, respectively, associated with the devaluation of the Argentine peso.