Schedule of Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Common Stock, Shares, Outstanding beginning of period	78,085,559
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,820
Net Income (Loss) Attributable to Parent	58	49
Net Income (Loss) Attributable to Noncontrolling Interest	0	(1)
Common Stock, Shares, Outstanding end of period	78,182,056
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,857
Common Stock [Member]
Common Stock, Shares, Outstanding beginning of period	78,085,559	75,556,272
Issuances of shares pursuant to equity-based plans	96,497	120,909
Common Stock, Shares, Outstanding end of period	78,182,056	75,677,181
Common Stock Including Additional Paid in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	911	841
Stock-based compensation	1
Dividends declared	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	912	841
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(5)	(6)
Stock-based compensation	0
Dividends declared	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(5)	(6)
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	913	893
Stock-based compensation	0
Dividends declared	(22)	(20)
Net Income (Loss) Attributable to Parent		49
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	949	922
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1	2
Stock-based compensation	0
Dividends declared	0	0
Net Income (Loss) Attributable to Noncontrolling Interest		(1)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1	$ 1