Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ in Millions	Jun. 30, 2020 USD ($)	Jun. 30, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)
Derivatives, Fair Value
Total asset derivatives	$ 41		$ 38		$ 46
Total liability derivatives	69		24		40
Current derivative asset	20		8		13
Current derivative liability	14				3
Noncurrent derivative asset	21		30		33
Noncurrent derivative liability	55		24		37
Derivatives designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives	36		36		44
Total liability derivatives	64		24		39
Derivatives designated as hedging instruments | Commodity forward contracts
Derivatives, Fair Value
Notional amount	11		13		19
Total asset derivatives			1		2
Total liability derivatives	1				1
Derivatives designated as hedging instruments | Interest rate swaps - fair value hedges
Derivatives, Fair Value
Notional amount | €		€ 725		€ 725		€ 725
Total asset derivatives	14		8		15
Total liability derivatives			2
Derivatives designated as hedging instruments | Interest rate swaps - cash flow hedges
Derivatives, Fair Value
Notional amount	105		105		480
Total asset derivatives					1
Total liability derivatives			1		2
Derivatives designated as hedging instruments | Cash flow hedges of foreign exchange risk
Derivatives, Fair Value
Notional amount	1,424		1,424		1,210
Total asset derivatives	18		25		20
Total liability derivatives	55		21		30
Derivatives not designated as hedging instruments | Foreign exchange derivative contracts
Derivatives, Fair Value
Notional amount	279		283		292
Total asset derivatives	5		2		2
Total liability derivatives	5				1
Net Investment Hedges | Derivatives designated as hedging instruments
Derivatives, Fair Value
Notional amount | €		€ 471		€ 160		€ 160
Total asset derivatives	4		$ 2		6
Total liability derivatives	$ 8				$ 6