Other Assets (Components Of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Income taxes receivable	$ 1,966		$ 1,822
Total	13,726		17,139
Other Assets [Member]
Real Estate Acquired Through Foreclosure	76		75
Reported Amount [Member] | Other Assets [Member]
Collateral deposits	6,238		6,688
Unrealized gains on derivative financial instruments	3,672		6,366
Investments in joint ventures and other unconsolidated entities	1,124		1,060
Accounts receivable	634		431
Deferred tax assets, net of valuation allowance	402		395
Prepaid expenses	332		308
Deposits with Clearing Organizations and Others, Securities	235		222
Income taxes receivable	206		989
Noncash collateral deposits	124		110
Other	$ 759	[1]	$ 570	[1]

[1] Amounts for March 31, 2012 and December 31, 2011 included other real estate owned of approximately $76 million and $75 million, respectively.