Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ in Millions	Mar. 31, 2018 EUR (€)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Derivatives, Fair Value
Total asset derivatives		$ 18		$ 17	$ 7
Total liability derivatives		$ 42		$ 24	$ 3
Senior Notes 3.125%, due 2024 (725 million EUR at March 31, 2018)
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 | Current receivables
Derivatives, Fair Value
Total asset derivatives		$ 4		$ 4	$ 5
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities (noncurrent)
Derivatives, Fair Value
Total liability derivatives		1		1	2
Derivatives designated as hedging instruments | Commodity futures contracts | Noncurrent Receivables.
Derivatives, Fair Value
Total asset derivatives		4		3	2
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 | Current receivables
Derivatives, Fair Value
Total asset derivatives		4		6
Derivatives designated as hedging instruments | Interest Rate Swaps | Other liabilities (noncurrent)
Derivatives, Fair Value
Total liability derivatives		15		13
Derivatives designated as hedging instruments | Hedges of multiple risks | Current receivables
Derivatives, Fair Value
Total asset derivatives		6		4
Derivatives designated as hedging instruments | Hedges of multiple risks | Other liabilities (noncurrent)
Derivatives, Fair Value
Total liability derivatives		$ 26		$ 10