Derivative Financial Instruments Derivative Financial Instruments - Fair Value of Foreign Exchange Contracts (Details) - Designated as Hedging Instrument - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other Assets
Derivatives, Fair Value [Line Items]
Other current assets	$ 0	$ 2
Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Other current liabilities	$ (6)	$ (18)

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

No definition available.

Name:	us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant