Financial Instruments (Details) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	[1]	$ 3,326	$ 3,325
Foreign currency forward contracts	[2]	8	6
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes	[1]	3,542	3,526
Foreign currency forward contracts	[2]	$ 8	$ 6

[1] The Company measures the fair value of its Senior Notes using Level 2 inputs based primarily on current market yields for its existing debt traded in the secondary market.

[2] The Company measures the fair values of foreign currency forward contracts based on forward exchange rates. See Note 17 for additional disclosures regarding the notional amounts and fair values of foreign currency forward contracts.