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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months $ 7,012 $ 8,074
Debt securities, available-for-sale, unrealized loss, less than 12 months (46) (138)
Debt securities, available-for-sale, fair value, 12 months or longer 1,450 12,046
Debt securities, available-for-sale, unrealized loss, 12 months or longer (27) (496)
Debt Securities, held-to-maturity, less than 12 Months, fair value 283 473
Debt securities, held-to-maturity, unrealized loss, less than 12 Months (6) (6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value 3 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 1,267 31
Debt securities, available-for-sale, unrealized loss, less than 12 months (11) 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 (6) (60)
US States and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 72 259
Debt securities, available-for-sale, unrealized loss, less than 12 months (1) (3)
Debt securities, available-for-sale, fair value, 12 months or longer 5 317
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 40 6
Debt securities, available-for-sale, unrealized loss, less than 12 months (1) 0
Debt securities, available-for-sale, fair value, 12 months or longer 3 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 4,606 5,537
Debt securities, available-for-sale, unrealized loss, less than 12 months (23) (94)
Debt securities, available-for-sale, fair value, 12 months or longer 908 7,808
Debt securities, available-for-sale, unrealized loss, 12 months or longer (13) (301)
Debt Securities, held-to-maturity, less than 12 Months, fair value 283 457
Debt securities, held-to-maturity, unrealized loss, less than 12 Months (6) (6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value 0 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 613 1,024
Debt securities, available-for-sale, unrealized loss, less than 12 months (4) (20)
Debt securities, available-for-sale, fair value, 12 months or longer 203 1,360
Debt securities, available-for-sale, unrealized loss, 12 months or longer (7) (91)
Agency mortgage-backed commercial    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 335 0
Debt securities, available-for-sale, unrealized loss, less than 12 months (6) 0
Debt securities, available-for-sale, fair value, 12 months or longer 0 0
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 0
Mortgage-backed commercial    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 0 347
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 8 294
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (1)
Debt securities, available-for-sale, fair value, 12 months or longer 11 124
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 3 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 71 576
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (19)
Debt securities, available-for-sale, fair value, 12 months or longer 41 569
Debt securities, available-for-sale, unrealized loss, 12 months or longer $ (1) $ (27)