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Federal Funds Sold, Securities Purchased under Resale Agreements and Other Short-Term Investments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Federal Funds Sold, Securities Purchased Under Resale Agreements and Other Short-Term Investments    
Federal funds sold and securities purchased under resale agreements $ 24,255 $ 24,880
Interest-earning deposits 18,917 53,433
Other short-term investments 1,195 2,324
Total $ 44,367 $ 80,637