Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ in Millions	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)
Derivatives, Fair Value
Total asset derivatives		$ 25		$ 17
Total liability derivatives		12		24
Current derivative asset		19		14
Current derivative liability		3
Noncurrent derivative asset		6		3
Noncurrent derivative liability		9		24
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other assets (current)
Derivatives, Fair Value
Notional amount		470		460
Total asset derivatives		2		4
Total liability derivatives		2		1
Derivatives designated as hedging instruments
Derivatives, Fair Value
Total asset derivatives		23		13
Total liability derivatives		10		23
Derivatives designated as hedging instruments | Commodity forwards contracts | Other assets (noncurrent)
Derivatives, Fair Value
Notional amount		21		30
Total asset derivatives		1		3
Total liability derivatives				13
Derivatives designated as hedging instruments | Interest Rate Swaps | Other assets (current)
Derivatives, Fair Value
Notional amount | €	€ 725		€ 725
Total asset derivatives		6		6
Total liability derivatives		1		10
Derivatives designated as hedging instruments | Cash flow hedges of foreign exchange risk | Other assets (current)
Derivatives, Fair Value
Notional amount		587		310
Total asset derivatives		10		$ 4
Total liability derivatives		1
Derivatives designated as hedging instruments | Cash flow hedges of interest rate risk | Other assets (current)
Derivatives, Fair Value
Notional amount		180
Derivatives designated as hedging instruments | Net investment hedges | Other assets (current)
Derivatives, Fair Value
Notional amount | €	€ 160
Total asset derivatives		6
Total liability derivatives		$ 8