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Consolidated Balance Sheet (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheet [Abstract]    
Held-to-maturity, fair value $ 19,216,000,000 $ 1,419,000,000
Mortgage loans, carried at fair value 6,925,000,000 8,100,000,000
Minimum amount of Time deposit $ 100,000 $ 100,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized (actual number of shares) 4,000,000,000 4,000,000,000
Common stock, shares issued (actual number of shares) 2,125,725,742 2,125,725,742
Treasury stock, shares (actual number of shares) 215,904,019 204,822,330