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Federal Funds Sold, Securities Purchased under Resale Agreements and Other Short-Term Investments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Federal Funds Sold, Securities Purchased Under Resale Agreements and Other Short-Term Investments    
Federal funds sold and securities purchased under resale agreements $ 27,748 $ 24,255
Interest-earning deposits 44,788 18,917
Other short-term investments 1,607 1,195
Total $ 74,143 $ 44,367