Quarterly report pursuant to Section 13 or 15(d)

Securities - Realized Gains and Losses (Details)

v3.5.0.2
Securities - Realized Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Net gains on sales of AFS debt securities     $ 490 $ 886
Debt securities        
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross gains $ 57 $ 441 513 899
Gross losses (6) (4) (23) (13)
Net gains on sales of AFS debt securities 51 437 490 886
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 19 $ 166 $ 186 $ 337