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Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ in Millions	Jun. 30, 2021 USD ($)	Jun. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 EUR (€)
Derivatives, Fair Value
Total asset derivatives	$ 20		$ 25		$ 41
Total liability derivatives	118		170		68
Current derivative asset	13		13		20
Current derivative liability	3		15		13
Noncurrent derivative asset	7		12		21
Noncurrent derivative liability	115		155		55
Derivatives designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	19		24		36
Total liability derivatives	116		167		63
Derivatives designated as hedging instruments \| Interest rate swaps - fair value hedges
Derivatives, Fair Value
Notional amount \| €		€ 725		€ 725		€ 725
Total asset derivatives	11		17		14
Total liability derivatives	1
Derivatives designated as hedging instruments \| Cash flow hedges of foreign exchange risk
Derivatives, Fair Value
Notional amount	878		978		1,424
Total asset derivatives	6		6		18
Total liability derivatives	75		115		55
Derivatives designated as hedging instruments \| Interest rate swaps - cash flow hedges
Derivatives, Fair Value
Notional amount	0		0		105
Derivatives designated as hedging instruments \| Net investment hedges
Derivatives, Fair Value
Notional amount \| €		€ 311		€ 311		€ 471
Total asset derivatives	2		1		4
Total liability derivatives	40		52		8
Derivatives not designated as hedging instruments \| Foreign exchange derivative contracts
Derivatives, Fair Value
Notional amount	305		247		279
Total asset derivatives	1		1		5
Total liability derivatives	$ 2		$ 3		$ 5