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Securities - Realized Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Net gains on sales of AFS debt securities $ 1,271 $ 1,662 $ 3,374
Debt Securities [Member]
     
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Gross gains 1,302 2,128 3,685
Gross losses (31) (466) (311)
Net gains on sales of AFS debt securities 1,271 1,662 3,374
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 470 $ 615 $ 1,248