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Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Total derivatives	$ 64		$ (20)
Collateral received	30
Cash flow hedges gain expected to be reclassified from AOCI into earnings over the next 12 months	1
Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Total derivatives	68		(14)
Foreign currency forward-exchange contracts \| Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Total derivatives	(4)		(6)
Foreign currency forward-exchange contracts	(5)	$ 6
Foreign currency forward-exchange contracts \| Derivatives Not Designated as Hedging Instruments \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	7		10
Foreign currency forward-exchange contracts \| Derivatives Not Designated as Hedging Instruments \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(11)		(16)
Forward-starting interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets	39		6
Forward-starting interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	0		17
Cross-currency interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	20		2
Cross-currency interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	3		21
Cross-currency interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets	10		5
Fixed-to-floating interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 2		$ 11