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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months $ 4,738 $ 8,074
Debt securities, available-for-sale, unrealized loss, less than 12 months (19) (138)
Debt securities, available-for-sale, fair value, 12 months or longer 1,900 12,046
Debt securities, available-for-sale, unrealized loss, 12 months or longer (31) (496)
Debt Securities, held-to-maturity, less than 12 Months, fair value 142 473
Debt securities, held-to-maturity, unrealized loss, less than 12 Months (1) (6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value 96 1,395
Debt securities, held-to-maturity, unrealized loss, 12 months or longer 0 (55)
US Treasury    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 1,131 31
Debt securities, available-for-sale, unrealized loss, less than 12 months (8) 0
Debt securities, available-for-sale, fair value, 12 months or longer 279 1,758
Debt securities, available-for-sale, unrealized loss, 12 months or longer (7) (60)
US States and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 63 259
Debt securities, available-for-sale, unrealized loss, less than 12 months (1) (3)
Debt securities, available-for-sale, fair value, 12 months or longer 9 317
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (14)
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 11 6
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 0
Debt securities, available-for-sale, fair value, 12 months or longer 4 74
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (1)
Agency mortgage-backed residential    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 2,722 5,537
Debt securities, available-for-sale, unrealized loss, less than 12 months (8) (94)
Debt securities, available-for-sale, fair value, 12 months or longer 1,317 7,808
Debt securities, available-for-sale, unrealized loss, 12 months or longer (15) (301)
Debt Securities, held-to-maturity, less than 12 Months, fair value 142 457
Debt securities, held-to-maturity, unrealized loss, less than 12 Months (1) (6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value 87 1,376
Debt securities, held-to-maturity, unrealized loss, 12 months or longer 0 (55)
Mortgage-backed residential    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 647 1,024
Debt securities, available-for-sale, unrealized loss, less than 12 months (2) (20)
Debt securities, available-for-sale, fair value, 12 months or longer 221 1,360
Debt securities, available-for-sale, unrealized loss, 12 months or longer (7) (91)
Mortgage-backed commercial    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 43 347
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (1)
Debt securities, available-for-sale, fair value, 12 months or longer 0 36
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (1)
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 17 294
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (1)
Debt securities, available-for-sale, fair value, 12 months or longer 13 124
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (1)
Debt Securities, held-to-maturity, less than 12 Months, fair value 0 16
Debt securities, held-to-maturity, unrealized loss, less than 12 Months 0 0
Debt Securities, held-to-maturity, 12 Months or Longer, fair value 9 19
Debt securities, held-to-maturity, unrealized loss, 12 months or longer 0 0
Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 104 576
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (19)
Debt securities, available-for-sale, fair value, 12 months or longer 57 569
Debt securities, available-for-sale, unrealized loss, 12 months or longer $ (2) $ (27)