Quarterly report pursuant to Section 13 or 15(d)

Securities - Realized Gains and Losses (Details)

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Securities - Realized Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Net gains on sales of AFS debt securities     $ 1,191 $ 881
Debt securities
       
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross gains 434 358 1,195 901
Gross losses (2) (2) (4) (20)
Net gains on sales of AFS debt securities 432 356 1,191 881
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 164 $ 132 $ 453 $ 326