Other Assets (Components Of Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Jun. 30, 2010
Income taxes receivable	$ 1,822		$ 1,733
Deferred tax assets, net of valuation allowance	1,249		1,786
Total	17,139		13,841		564,000
Real Estate Acquired Through Foreclosure	79
Other Assets [Member]
Real Estate Acquired Through Foreclosure	75
Reported Amount [Member] | Other Assets [Member]
Collateral deposits	6,688		3,251
Unrealized gains on derivative financial instruments	6,366		5,255
Investments in joint ventures and other unconsolidated entities	1,060		927
Income taxes receivable	989		530
Accounts receivable	431		290
Deferred tax assets, net of valuation allowance	395	[1]	1,786	[1]
Prepaid expenses	308		382
Receivable for securities sold			122
Other	$ 902	[2]	$ 1,298	[2]

[1] Deferred tax assets as of December 31, 2011 are net of deferred tax liabilities within the same tax jurisdiction.

[2] Amount for 2011 included other real estate owned of approximately $75 million.