Loans - Purchased, Sold and Reclassified to Held-for-Sale (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Retained Loans Purchases Sales and Transfer Into Held For Sale By Portfolio Segment [Line Items]
Purchases	$ 8,641	$ 7,428
Sales	9,077	5,275
Retained loans reclassified to held-for-sale	7,211	1,547
Consumer, excluding credit card [Member]
Retained Loans Purchases Sales and Transfer Into Held For Sale By Portfolio Segment [Line Items]
Purchases	7,616	6,601
Sales	4,845	1,852
Retained loans reclassified to held-for-sale	1,261	0
Excluded retained loans purchased from correspondents that were originated in accordance with the Firm's underwriting standards	5,700	1,424
Credit card [Member]
Retained Loans Purchases Sales and Transfer Into Held For Sale By Portfolio Segment [Line Items]
Purchases	328	0
Sales	0	0
Retained loans reclassified to held-for-sale	309	1,043
Wholesale-related [Member]
Retained Loans Purchases Sales and Transfer Into Held For Sale By Portfolio Segment [Line Items]
Purchases	697	827
Sales	4,232	3,423
Retained loans reclassified to held-for-sale	$ 5,641	$ 504