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Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Total derivatives	$ 32		$ 32		$ (20)
Collateral received	21		21
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	43		43		(14)
Foreign currency forward-exchange contracts \| Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Total derivatives	(11)		(11)		(6)
Foreign currency forward-exchange contracts	(6)	$ 4	(11)	$ 10
Foreign currency forward-exchange contracts \| Derivatives Not Designated as Hedging Instruments \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	5		5		10
Foreign currency forward-exchange contracts \| Derivatives Not Designated as Hedging Instruments \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(16)		(16)		(16)
Forward-starting interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets	18		18		6
Forward-starting interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	4		4		17
Cross-currency interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	16		16		2
Cross-currency interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	0		0		21
Cross-currency interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets	8		8		5
Fixed-to-floating interest rate swap contracts \| Derivatives Designated as Hedging Instruments: \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 5		$ 5		$ 11