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
Mar. 31, 2018
Mar. 31, 2017
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]    
Net gains on sales of AFS debt securities $ 2 $ 52
Debt securities    
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]    
Gross gains 2 54
Gross losses 0 (2)
Net gains on sales of AFS debt securities 2 52
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 0 $ 20