Consolidations and Transfers of Financial Assets Unconsolidated VIEs (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Assets and liabilities recorded in our consolidated balance sheets:
Available-for-sale, at fair value	$ 63,181		$ 77,582
Trading, at fair value	40,695		74,198
Other assets	27,939		25,374
Other liabilities	(14,378)		(13,535)
Unconsolidated VIEs [Member] | Mortgage-Backed Trusts [Member]
Assets and liabilities recorded in our consolidated balance sheets:
Available-for-sale, at fair value	57,004	[1]	69,101	[1]
Trading, at fair value	22,706	[1]	24,292	[1]
Other assets	145		271
Other liabilities	(1,449)		(1,347)
Net carrying amount	78,406		92,317
Maximum exposure to loss	87,397	[1]	100,146	[1]
Total assets of unconsolidated VIEs	645,332	[1]	641,346	[1]
Unconsolidated VIEs [Member] | Asset-Backed Trusts [Member]
Assets and liabilities recorded in our consolidated balance sheets:
Available-for-sale, at fair value			0	[1]
Trading, at fair value			2,111	[1]
Other assets			0
Other liabilities			0
Net carrying amount			2,111
Maximum exposure to loss			2,111	[1]
Total assets of unconsolidated VIEs			256,845	[1]
Unconsolidated VIEs [Member] | Limited Partnership Investments [Member]
Assets and liabilities recorded in our consolidated balance sheets:
Available-for-sale, at fair value	0	[1]	0	[1]
Trading, at fair value	0	[1]	0	[1]
Other assets	120		145
Other liabilities	(124)		(153)
Net carrying amount	(4)		(8)
Maximum exposure to loss	118	[1]	137	[1]
Total assets of unconsolidated VIEs	$ 11,675	[1]	$ 12,256	[1]

[1] Contains securities recognized in our consolidated balance sheets due to consolidation of certain multi-class resecuritization trusts.