Schedule of Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 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	35	(22)	93	27
Net Income (Loss) Attributable to Noncontrolling Interest	0	0	0	(1)
Common Stock, Shares, Outstanding end of period	78,202,241		78,202,241
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,872		1,872
Common Stock [Member]
Common Stock, Shares, Outstanding beginning of period			78,085,559	75,556,272
Stock Issued During Period, Shares, New Issues				1,665,000
Issuances of shares pursuant to equity-based plans			116,682	141,186
Common Stock, Shares, Outstanding end of period	78,202,241	77,362,458	78,202,241	77,362,458
Common Stock Including Additional Paid in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			911	841
Stock Issued During Period, Value, New Issues				47
Stock-based compensation			3	1
Dividends declared			0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	914	889	914	889
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			(5)	(6)
Stock-based compensation			0	0
Dividends declared			0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(5)	(6)	(5)	(6)
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			913	893
Stock-based compensation			0	0
Dividends declared			(44)	(42)
Net Income (Loss) Attributable to Parent				27
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	962	878	962	878
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest			1	2
Stock-based compensation			0	0
Dividends declared			0	0
Net Income (Loss) Attributable to Noncontrolling Interest				(1)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1	$ 1	$ 1	$ 1