Consolidated Statement 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, 2014					$ (404)
Net loss							$ (51)
Other comprehensive income, net of tax					3		$ 3
Balance at Mar. 31, 2015					(401)
Preferred Stock Balance (in shares) at Dec. 31, 2015	19,250,000						19,250,000
Balance at Dec. 31, 2015		$ 298	$ 6,034	$ (87)	(353)	$ (278)	$ 5,614
Balance (in shares) at Dec. 31, 2015		1,192,986,000				24,786,000	1,168,200,000
Stock plans			(56)			$ 53	$ (3)
Stock plans (in shares)						4,458,000
Dividends on common stock			(123)				(123)
Dividends on preferred stock			(54)				(54)
Net loss				(186)			(186)
Other comprehensive income, net of tax					6		$ 6
Preferred Stock Balance (in shares) at Mar. 31, 2016	19,250,000						19,250,000
Balance at Mar. 31, 2016		$ 298	$ 5,801	$ (273)	$ (347)	$ (225)	$ 5,254
Balance (in shares) at Mar. 31, 2016		1,192,986,000				20,328,000	1,172,658,000