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Securities - Gains and Losses on Sales of AFS Debt Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross gains $ 83 $ 130 $ 86 $ 286
Gross losses (10) (5) (10) (8)
Net gains on sales of AFS debt securities 73 125 76 278
Income tax expense attributable to realized net gains on sales of AFS debt securities $ 17 $ 48 $ 18 $ 106