Derivative Instruments - Balance Sheet Classification (Details) € in Millions, $ in Millions	Sep. 30, 2018 EUR (€)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2017
Derivatives, Fair Value
Total asset derivatives		$ 30		$ 17	$ 5
Total liability derivatives		$ 29		$ 24	9
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 assets (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		1		1	3
Derivatives designated as hedging instruments | Commodity futures contracts | Other assets (noncurrent)
Derivatives, Fair Value
Total asset derivatives		8		3	1
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 assets (current)
Derivatives, Fair Value
Total asset derivatives		4		6	2
Derivatives designated as hedging instruments | Interest Rate Swaps | Other liabilities (noncurrent)
Derivatives, Fair Value
Total liability derivatives		11		13	$ 5
Derivatives designated as hedging instruments | Cash flow hedges of foreign exchange risk | Other assets (current)
Derivatives, Fair Value
Total asset derivatives		11		4
Derivatives designated as hedging instruments | Cash flow hedges of foreign exchange risk | Other liabilities (noncurrent)
Derivatives, Fair Value
Total liability derivatives		12		$ 10
Derivatives designated as hedging instruments | Net investment hedges | Other assets (current)
Derivatives, Fair Value
Total asset derivatives		5
Derivatives designated as hedging instruments | Net investment hedges | Other liabilities (noncurrent)
Derivatives, Fair Value
Total liability derivatives		$ 5