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, 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)
Net income (loss)	256	256			256
Total other comprehensive income (loss)	73	73				73
Share-based compensation, net of tax of $2	(3)	(3)	3	0			(6)
Share-based compensation (in shares)			3,479,149				(524,102)
Balance as of at Mar. 31, 2014	$ 3,625	$ 3,604	$ 281	$ 3,115	$ 2,545	$ (13)	$ (2,324)		$ 21
Balance (in preferred stock shares) as of at Mar. 31, 2014	0							1,315
Balance (in common stock shares) as of at Mar. 31, 2014	281,291,579		281,291,579				(86,086,648)