Consolidated Statement Of Changes In Shareholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Millions	Total	Parent [Member]	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Preferred Stock [Member]	Preferred Stock Of Subsidiary And Noncontrolling Interest [Member]
Balance as of at Dec. 31, 2014	$ 3,950	$ 3,929	$ 281	$ 3,128	$ 2,858	$ 21	$ (2,359)		$ 21
Balance (in common stock shares) as of at Dec. 31, 2014	281,352,782		281,352,782				(89,409,887)
Balance (in preferred stock shares) as of at Dec. 31, 2014	0							1,315
ASU 2015-02 Transition Adjustment	$ (9)								(9)
Net income (loss)	133	133			133
Other comprehensive income (loss)	(57)	(57)				(57)
Share-based compensation, net of tax of $9	1	1	$ 1	1			$ (1)
Share-based compensation (in shares)			391,760				(180,210)
Treasury shares acquired	(177)	(177)					$ (177)
Treasury shares acquired (in shares)							(20,175,736)
Balance as of at Jun. 30, 2015	$ 3,841	$ 3,829	$ 282	$ 3,129	$ 2,991	$ (36)	$ (2,537)		$ 12
Balance (in common stock shares) as of at Jun. 30, 2015	281,744,542		281,744,542				(109,765,833)
Balance (in preferred stock shares) as of at Jun. 30, 2015	0							1,315