Loans - Consumer, Excluding Credit Card Loans, PCI Accretable Yield Activity (Details) (Consumer, excluding credit card [Member], Purchased Credit-Impaired [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consumer, excluding credit card [Member] | Purchased Credit-Impaired [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Beginning balance	$ 18,457	$ 19,072	$ 19,097
Accretion into interest income	(2,201)	(2,491)	(2,767)
Changes in interest rates on variable-rate loans	(287)	(449)	(573)
Other changes in expected cash flows	198	2,325	3,315
Balance at December 31	$ 16,167	$ 18,457	$ 19,072
Accretable yield percentage	4.31%	4.38%	4.33%