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Accumulated Other Comprehensive Income (Loss) - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]            
Tax (benefit) expense included in net unrealized gains (losses), investment securities $ 13 $ (65) $ 147 $ 243    
Tax included in reclassification, investment securities (2) (6) (11) (30)    
Tax included in amortization, investment securities 3 4 8 11    
Cumulative effect of new accounting principle in period of adoption, tax         $ 103 $ 0
Tax (benefit) expense included in net unrealized gains (losses), fair value option liabilities (26) 0 (78) 0    
Tax (benefit) expense included in net unrealized gains (losses), cash flow hedges (2) 5 (6) (33)    
Tax included in reclassification, cash flow hedges $ 2 $ 2 $ 4 $ 5