Consolidations and Transfers of Financial Assets Unconsolidated VIEs (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Assets and liabilities recorded in our condensed consolidated balance sheets [Abstract]
Available-for-sale, at fair value	$ 66,352		$ 77,582
Trading, at fair value	42,522		74,198
Other assets	28,121		25,374
Other liabilities	(15,396)		(13,535)
Unconsolidated VIEs [Member] | Mortgage-Backed Trusts [Member]
Assets and liabilities recorded in our condensed consolidated balance sheets [Abstract]
Available-for-sale, at fair value	59,336	[1]	69,101	[1]
Trading, at fair value	22,579	[1]	24,292	[1]
Other assets	184		271
Other liabilities	(1,574)		(1,347)
Net carrying amount	80,525		92,317
Maximum exposure to loss	90,283	[1]	100,146	[1]
Total assets of unconsolidated VIEs	629,950	[1]	641,346	[1]
Unconsolidated VIEs [Member] | Asset-Backed Trusts [Member]
Assets and liabilities recorded in our condensed consolidated balance sheets [Abstract]
Available-for-sale, at fair value	0	[1]	0	[1]
Trading, at fair value	0	[1]	2,111	[1]
Other assets	0		0
Other liabilities	0		0
Net carrying amount	0		2,111
Maximum exposure to loss	0	[1]	2,111	[1]
Total assets of unconsolidated VIEs	0	[1]	256,845	[1]
Unconsolidated VIEs [Member] | Limited Partnership Investments [Member]
Assets and liabilities recorded in our condensed consolidated balance sheets [Abstract]
Available-for-sale, at fair value	0	[1]	0	[1]
Trading, at fair value	0	[1]	0	[1]
Other assets	115		145
Other liabilities	(127)		(153)
Net carrying amount	(12)		(8)
Maximum exposure to loss	110	[1]	137	[1]
Total assets of unconsolidated VIEs	$ 10,982	[1]	$ 12,256	[1]

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