Net Income Per Share (Reconciliation Of Earnings Attributable To Common Stockholders, Basic And Diluted) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement Operating Activities Segment [Line Items]
Basic income (loss) from continuing operations attributable to common stockholders	$ (218)	$ 1	$ (296)	$ 123
Diluted income (loss) from continuing operations attributable to common stockholders	(218)	1	(296)	123
Continuing Operations [Member]
Statement Operating Activities Segment [Line Items]
Income (loss) from continuing operations attributable to parent	(217)	55	(292)	200
Participating Securities, Distributed and Undistributed Earnings, Basic	0	0	0	(1)
Basic income (loss) from continuing operations attributable to common stockholders	(217)	55	(292)	199
Diluted income (loss) from continuing operations attributable to common stockholders	(217)	55	(292)	199
Discontinued Operations [Member]
Statement Operating Activities Segment [Line Items]
Basic income (loss) from continuing operations attributable to common stockholders	(1)	(54)	(4)	(76)
Diluted income (loss) from continuing operations attributable to common stockholders	$ (1)	$ (54)	$ (4)	$ (76)