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
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Net gains on sales of AFS debt securities     $ 821 $ 1,191
Debt securities        
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross gains $ 399 $ 434 844 1,195
Gross losses (14) (2) (23) (4)
Net gains on sales of AFS debt securities 385 432 821 1,191
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 146 $ 164 $ 312 $ 453