Consolidated Statement Of Changes In Equity - USD ($) $ in Millions		Total	Common stock and paid-in capital [Member]	Preferred stock [Member]	Retained earnings (accumulated deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2013		$ 14,208	$ 20,939	$ 1,255	$ (7,710)	$ (276)	$ 0
Net income (loss)		973			973
Preferred stock dividends		(200)			(200)
Employee Benefits and Share-based Compensation		83	83
Other comprehensive income (loss)		126				126
Ending Balance at Sep. 30, 2014		15,190	21,022	1,255	(6,937)	(150)	0
Beginning Balance at Dec. 31, 2014		15,399	21,038	1,255	(6,828)	(66)	0
Net income (loss)		1,026			1,026
Preferred stock dividends	[1]	(1,356)			(1,356)
Stock Repurchased During Period, Value		(325)		(325)
Preferred stock redemption		(117)		(117)
Employee Benefits and Share-based Compensation		44	44
Other comprehensive income (loss)		(56)				(56)
Share repurchases related to employee stock-based compensation awards		(16)					(16)
Ending Balance at Sep. 30, 2015		14,599	$ 21,082	$ 813	$ (7,158)	$ (122)	$ (16)
Stock Repurchase and Redemption Premium		$ 1,193

[1] Preferred stock dividends for the nine months ended September 30, 2015, include $1,193 million recognized in connection with the partial redemption of the Series G Preferred Stock and the repurchase of the Series A Preferred Stock. These dividends represent an additional return to preferred shareholders calculated as the excess consideration paid over the carrying amount derecognized. Refer to Note 16 for additional preferred stock information.