Consolidated Statement Of Equity - USD ($) $ in Millions	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Common Stock [Member]	Total
Balance at Dec. 31, 2014					$ (404)
Net loss							$ (93)
Other comprehensive income, net of tax					13		$ 13
Preferred Stock Balance (in shares) at Sep. 30, 2015							19,250,000
Balance at Sep. 30, 2015					(391)
Preferred Stock Balance (in shares) at Dec. 31, 2015	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			(47)			$ 64	$ 17
Stock plans (in shares)						4,908,000
Dividends on common stock			(370)				(370)
Dividends on preferred stock			(161)				(161)
Net loss				(293)			(293)
Other comprehensive income, net of tax					(50)		$ (50)
Preferred Stock Balance (in shares) at Sep. 30, 2016	19,250,000						19,250,000
Balance at Sep. 30, 2016		$ 298	$ 5,456	$ (380)	$ (403)	$ (214)	$ 4,757
Balance (in shares) at Sep. 30, 2016		1,192,986,000				(19,878,000)	1,173,108,000