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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Net gains on sales of debt securities $ 356 $ 339 $ 881 $ 1,491
Debt Securities [Member]
       
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross Gains 358 361 901 1,957
Gross Losses (2) (22) (20) (466)
Net gains on sales of debt securities 356 339 881 1,491
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 132 $ 125 $ 326 $ 552