Quarterly report pursuant to Section 13 or 15(d)

Securities - Gains and Losses on Sales of AFS Debt Securities (Details)

v3.8.0.1
Securities - Gains and Losses on Sales of AFS Debt Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Net gains on sales of AFS debt securities     $ 278 $ 490
Debt securities        
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross gains $ 130 $ 57 286 513
Gross losses (5) (6) (8) (23)
Net gains on sales of AFS debt securities 125 51 278 490
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 48 $ 19 $ 106 $ 186