Annual report pursuant to Section 13 and 15(d)

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

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Securities - Gains and Losses on Sales of AFS Debt Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Gross gains $ 169 $ 352 $ 520
Gross losses (15) (97) (30)
Net gains on sales of AFS debt securities 154 255 490
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 37 $ 97 $ 186