Stockholders' Equity - Accumulated Other Comprehensive Loss Primarily Comprised of Accumulated Foreign Currency Translation (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Total accumulated other comprehensive loss	$ (77)	$ (63)
Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Total accumulated other comprehensive loss	$ (77)	$ (63)

Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. 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_AociBeforeTaxAttributableToParent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant