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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Securities [Line Items]    
Debt Securities, held-to-maturity, less than 12 Months, fair value   $ 283
Debt securities, held-to-maturity, unrealized loss, less than 12 Months   (6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value   3
Debt securities, held-to-maturity, unrealized loss, 12 months or longer   0
Debt securities, available-for-sale, fair value, less than 12 months $ 2,446 7,012
Debt securities, available-for-sale, unrealized loss, less than 12 months (85) (46)
Debt securities, available-for-sale, fair value, 12 months or longer 53 1,450
Debt securities, available-for-sale, unrealized loss, 12 months or longer (6) (27)
US Treasury    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 3 1,267
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (11)
Debt securities, available-for-sale, fair value, 12 months or longer 0 279
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (6)
US States and political subdivisions    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 96 72
Debt securities, available-for-sale, unrealized loss, less than 12 months (1) (1)
Debt securities, available-for-sale, fair value, 12 months or longer 5 5
Debt securities, available-for-sale, unrealized loss, 12 months or longer (1) 0
Foreign government    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 0 40
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 3
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 0
Agency mortgage-backed residential    
Debt Securities [Line Items]    
Debt Securities, held-to-maturity, less than 12 Months, fair value   283
Debt securities, held-to-maturity, unrealized loss, less than 12 Months   (6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value   0
Debt securities, held-to-maturity, unrealized loss, 12 months or longer   0
Debt securities, available-for-sale, fair value, less than 12 months 22 4,606
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (23)
Debt securities, available-for-sale, fair value, 12 months or longer 11 908
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (13)
Mortgage-backed residential    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 1,459 613
Debt securities, available-for-sale, unrealized loss, less than 12 months (51) (4)
Debt securities, available-for-sale, fair value, 12 months or longer 22 203
Debt securities, available-for-sale, unrealized loss, 12 months or longer (3) (7)
Agency mortgage-backed commercial    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 3 335
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 (6)
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 [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 37 0
Debt securities, available-for-sale, unrealized loss, less than 12 months (4) 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
Asset-backed    
Debt Securities [Line Items]    
Debt Securities, held-to-maturity, less than 12 Months, fair value   0
Debt securities, held-to-maturity, unrealized loss, less than 12 Months   0
Debt Securities, held-to-maturity, 12 Months or Longer, fair value   3
Debt securities, held-to-maturity, unrealized loss, 12 months or longer   0
Debt securities, available-for-sale, fair value, less than 12 months 256 8
Debt securities, available-for-sale, unrealized loss, less than 12 months (4) 0
Debt securities, available-for-sale, fair value, 12 months or longer 2 11
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 0
Corporate debt    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 570 71
Debt securities, available-for-sale, unrealized loss, less than 12 months (25) 0
Debt securities, available-for-sale, fair value, 12 months or longer 13 41
Debt securities, available-for-sale, unrealized loss, 12 months or longer $ (2) $ (1)