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 (Loss) [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)	549	549			549
Total other comprehensive income (loss)	72	72				72
Share-based compensation, net of tax of $2	5	5	3	8			(6)
Share-based compensation (in shares)			3,547,021				(518,676)
Treasury shares acquired under share repurchase program	(23)	(23)					(23)
Treasury shares acquired (in shares)							(2,086,737)
Balance as of at Sep. 30, 2014	$ 3,902	$ 3,881	$ 281	$ 3,123	$ 2,838	$ (14)	$ (2,347)		$ 21
Balance (in preferred stock shares) as of at Sep. 30, 2014	0							1,315
Balance (in common stock shares) as of at Sep. 30, 2014	281,359,451		281,359,451				(88,167,959)