Consolidated Statements Of Equity - USD ($) $ in Millions	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2013					$ (260)
Net income							$ 119
Other comprehensive income, net of tax					8		8
Balance at Sep. 30, 2014					(252)
Balance at Dec. 31, 2014		$ 257	$ 3,990	$ 109	(404)	$ (294)	$ 3,658
Balance (in shares) at Dec. 31, 2014		1,027,986,000				25,517,000	1,002,469,000
Stock Issued During Period, Shares, New Issues	19,250,000	165,000,000
Issuance of common stock		$ 41	758				$ 799
Issuance of preferred stock			1,866				1,866
Stock plans			(4)			$ 16	12
Stock plans (in shares)						749,000
Dividends on common stock			(333)				(333)
Dividends on preferred stock			(67)				(67)
Net income				(93)			(93)
Other comprehensive income, net of tax					13		$ 13
Preferred Stock Balance (in shares) at Sep. 30, 2015	19,250,000						19,250,000
Balance at Sep. 30, 2015		$ 298	$ 6,210	$ 16	$ (391)	$ (278)	$ 5,855
Balance (in shares) at Sep. 30, 2015		1,192,986,000				24,768,000	1,168,218,000