Annual report pursuant to Section 13 and 15(d)

Securities Securities - Realized Gains and Losses (Details)

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Securities Securities - Realized Gains and Losses (Details) (Debt Securities [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Debt Securities [Member]
     
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Gross Gains $ 3,685 $ 3,995 $ 5,047
Gross Losses (311) (1,469) (324)
Net gains on sales of AFS debt securities 3,374 2,526 4,723
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 1,248 $ 935 $ 1,748