Other Assets (Components of Other Assets) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Income taxes receivable	$ 1,871	$ 1,733
Total	19,754	13,800
Reported Amount [Member] | Other Assets [Member]
Unrealized gains on derivative financial instruments	4,675	5,255
Collateral deposits	6,241	3,251
Receivable for securities sold	2,717	9
Deferred tax assets, net of valuation allowance	1,470	1,786
Investments in joint ventures and other unconsolidated entities	1,008	927
Income taxes receivable	497	530
Accounts receivable	729	403
Prepaid expenses	363	382
Other	$ 2,054	$ 1,257