Stockholders' Equity - Accumulated Other Comprehensive Loss Primarily Comprised of Accumulated Foreign Currency Translation (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Schedule Of Capitalization Equity [Line Items]
Total accumulated other comprehensive loss	$ (31)
Cumulative Foreign Currency Translation Adjustments
Schedule Of Capitalization Equity [Line Items]
Total accumulated other comprehensive loss	$ (31)

Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

No definition available.

Name:	us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant