Other Assets (Components Of Other Assets) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Income taxes receivable	$ 1,932	$ 1,733
Total	24,704	13,841
Reported Amount [Member] | Other Assets [Member]
Unrealized gains on derivative financial instruments	11,363	5,255
Collateral deposits	7,507	3,251
Receivable for securities sold	372	122
Accounts receivable	746	290
Deferred tax assets, net of valuation allowance	1,619	1,786
Investments in joint ventures and other unconsolidated entities	1,002	927
Income taxes receivable	560	530
Prepaid expenses	389	382
Other	$ 1,146	$ 1,298