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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months $ 1,395 $ 8,074
Debt securities, available-for-sale, unrealized loss, less than 12 months (2) (138)
Debt securities, available-for-sale, fair value, 12 months or longer 8,865 12,046
Debt securities, available-for-sale, unrealized loss, 12 months or longer (87) (496)
Debt Securities, held-to-maturity, less than 12 Months, fair value 458 473
Debt securities, held-to-maturity, unrealized loss, less than 12 Months (3) (6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value 0 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 0 31
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 0
Debt securities, available-for-sale, fair value, 12 months or longer 1,532 1,758
Debt securities, available-for-sale, unrealized loss, 12 months or longer (12) (60)
US States and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 0 259
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (3)
Debt securities, available-for-sale, fair value, 12 months or longer 46 317
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 5 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 8 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 1,033 5,537
Debt securities, available-for-sale, unrealized loss, less than 12 months (1) (94)
Debt securities, available-for-sale, fair value, 12 months or longer 5,713 7,808
Debt securities, available-for-sale, unrealized loss, 12 months or longer (61) (301)
Debt Securities, held-to-maturity, less than 12 Months, fair value 447 457
Debt securities, held-to-maturity, unrealized loss, less than 12 Months (3) (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 26 1,024
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (20)
Debt securities, available-for-sale, fair value, 12 months or longer 1,235 1,360
Debt securities, available-for-sale, unrealized loss, 12 months or longer (11) (91)
Agency mortgage-backed commercial    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 10 0
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 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 280 347
Debt securities, available-for-sale, unrealized loss, less than 12 months (1) (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 6 294
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (1)
Debt securities, available-for-sale, fair value, 12 months or longer 75 124
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (1)
Debt Securities, held-to-maturity, less than 12 Months, fair value 11 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 0 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 35 576
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (19)
Debt securities, available-for-sale, fair value, 12 months or longer 256 569
Debt securities, available-for-sale, unrealized loss, 12 months or longer $ (3) $ (27)