Consolidated Statement Of Changes In Shareholders' Equity (USD $) In Millions, except Share data	Total USD ($)	Parent [Member] USD ($)	Common Stock [Member] USD ($)	Additional Paid In Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income [Member] USD ($)	Treasury Stock [Member] USD ($)	Preferred Stock [Member]	Preferred Stock Of Subsidiary And Noncontrolling Interest [Member] USD ($)
Balance as of at Dec. 31, 2010	$ 2,846	$ 2,832	$ 275	$ 3,064	$ 2,124	$ (406)	$ (2,225)		$ 14
Balance (in preferred stock shares) as of at Dec. 31, 2010								1,426
Balance (in common stock shares) as of at Dec. 31, 2010			274,719,578				(74,973,978)
Net income (loss)	(1,319)	(1,319)			(1,319)
Total other comprehensive income (loss)	230	230				230
Share-based compensation, net of tax of $4; net of tax of $7; net of tax of $4	7	7		8			(1)
Share-based compensation (in shares)			176,584				(237,912)
Treasury shares acquired	(50)	(50)					(50)
Treasury shares acquired (in shares)							(6,541,076)
Preferred shares of subsidiary acquired	(2)								(2)
Preferred shares of subsidiary acquired (in shares)								(111)
Change in noncontrolling interest in subsidiary	11								11
Balance as of at Dec. 31, 2011	1,723	1,700	275	3,072	805	(176)	(2,276)		23
Balance (in preferred stock shares) as of at Dec. 31, 2011								1,315
Balance (in common stock shares) as of at Dec. 31, 2011			274,896,162				(81,752,966)
Net income (loss)	1,234	1,234			1,234
Total other comprehensive income (loss)	232	232				232
Share-based compensation, net of tax of $4; net of tax of $7; net of tax of $4	7	7	2	4			1
Share-based compensation (in shares)			2,508,877				19,436
Change in noncontrolling interest in subsidiary	(2)								(2)
Balance as of at Dec. 31, 2012	3,194	3,173	277	3,076	2,039	56	(2,275)		21
Balance (in preferred stock shares) as of at Dec. 31, 2012	0							1,315
Balance (in common stock shares) as of at Dec. 31, 2012	277,405,039		277,405,039				(81,733,530)
Net income (loss)	250	250			250
Total other comprehensive income (loss)	(142)	(142)				(142)
Share-based compensation, net of tax of $4; net of tax of $7; net of tax of $4	4	4	1	39			(36)
Share-based compensation (in shares)			407,391				(3,292,641)
Treasury shares acquired	(7)	(7)					(7)
Treasury shares acquired (in shares)							(536,375)
Balance as of at Dec. 31, 2013	$ 3,299	$ 3,278	$ 278	$ 3,115	$ 2,289	$ (86)	$ (2,318)		$ 21
Balance (in preferred stock shares) as of at Dec. 31, 2013	0							1,315
Balance (in common stock shares) as of at Dec. 31, 2013	277,812,430		277,812,430				(85,562,546)