Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ in Millions	Jun. 30, 2018 EUR (€)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017
Derivatives, Fair Value
Total asset derivatives		$ 20		$ 17	$ 2
Total liability derivatives		$ 22		$ 24	7
Senior Notes 3.125%, due 2024 (725 million EUR)
Derivatives, Fair Value
Amount Hedged | €	€ 725		€ 725
Receive Rate	3.125%	3.125%	3.125%	3.125%		3.125%
Average Spread	2.60%	2.60%	2.60%	2.60%
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other assests (current)
Derivatives, Fair Value
Total asset derivatives		$ 2		$ 4	2
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities (current)
Derivatives, Fair Value
Total liability derivatives		2		1	3
Derivatives designated as hedging instruments | Commodity futures contracts | Other assests (noncurrent)
Derivatives, Fair Value
Total asset derivatives		7		3
Derivatives designated as hedging instruments | Commodity futures contracts | Other liabilities (current)
Derivatives, Fair Value
Total liability derivatives					1
Derivatives designated as hedging instruments | Interest Rate Swaps | Other assests (current)
Derivatives, Fair Value
Total asset derivatives		6		6
Derivatives designated as hedging instruments | Interest Rate Swaps | Other liabilities (noncurrent)
Derivatives, Fair Value
Total liability derivatives		8		13
Derivatives designated as hedging instruments | Hedges of multiple risks | Other assests (current)
Derivatives, Fair Value
Total asset derivatives		5		4
Derivatives designated as hedging instruments | Hedges of multiple risks | Other liabilities (noncurrent)
Derivatives, Fair Value
Total liability derivatives		$ 12		$ 10	$ 3