Selected Quarterly Financial Data (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Net interest income	$ 526	$ 492	$ 518	$ 505	$ 526	$ 510	$ 535	$ 587	$ 2,041	[1]	$ 2,158	[1]	$ 2,434
Provision for credit losses	51	54	67	21	120	84	89	0	193		293		258
Net interest income after provision for credit losses	475	438	451	484	406	426	446	587	1,848		1,865		2,176
Other revenues	267	432	566	592	303	408	879	383	1,857		1,973		2,325
Operating expenses	1,540	855	788	789	681	1,628	1,567	872	3,972	[2]	4,748	[2]	3,819
Income (loss) from continuing operations before income tax expense	(798)	15	229	287	28	(794)	(242)	98	(267)		(910)		682
Income tax expense	(93)	11	49	104	(19)	(12)	351	18	71		338		227
Income (loss) from continuing operations	(705)	4	180	183	47	(782)	(593)	80	(338)		(1,248)		455
Income from discontinued operations, net of tax	0	0	0	0	0	0	48	155	0		203		563
Net income (loss)	$ (705)	$ 4	$ 180	$ 183	$ 47	$ (782)	$ (545)	$ 235	$ (338)		$ (1,045)		$ 1,018

[1] Net interest income of each segment represents the difference between actual interest earned on assets and interest paid on liabilities of the segment adjusted for a funding charge or credit. Segments are charged a cost to fund assets (e.g. customer loans) and receive a funding credit for funds provided (e.g. customer deposits) based on equivalent market rates. The objective of these charges/credits is to transfer interest rate risk from the segments to one centralized unit in Treasury and more appropriately reflect the profitability of segments.

[2] Expenses for the segments include fully apportioned corporate overhead expenses.