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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Net gains on sales of debt securities $ 339 $ 737 $ 1,491 $ 2,182
Debt Securities [Member]
       
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross Gains 361 745 1,957 2,200
Gross Losses (22) (8) (466) (18)
Net gains on sales of debt securities 339 737 1,491 2,182
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 125 $ 273 $ 552 $ 807