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Summary of Significant Accounting Policies (Details Textuals) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010 Scenario Adjustment Balance [Member]
Summary Of Significant Accounting Policies Textuals [Line Items]
Cash and cash due from banks	$ 3,063	$ 3,514	$ 353
Other liabilities	$ 16,951	$ 17,157	$ 353

For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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