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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Net gains on sales of AFS debt securities     $ 436 $ 759
Debt securities        
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross gains $ 170 $ 383 445 761
Gross losses (2) (1) (9) (2)
Net gains on sales of AFS debt securities 168 382 436 759
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 64 $ 145 $ 166 $ 288