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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months $ 2,630 $ 7,012
Debt securities, available-for-sale, unrealized loss, less than 12 months (21) (46)
Debt securities, available-for-sale, fair value, 12 months or longer 5 1,450
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (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 83 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 0 5
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 0
Foreign government    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 7 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, available-for-sale, fair value, less than 12 months 1,225 4,606
Debt securities, available-for-sale, unrealized loss, less than 12 months (3) (23)
Debt securities, available-for-sale, fair value, 12 months or longer 0 908
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 316 613
Debt securities, available-for-sale, unrealized loss, less than 12 months (4) (4)
Debt securities, available-for-sale, fair value, 12 months or longer 0 203
Debt securities, available-for-sale, unrealized loss, 12 months or longer 0 (7)
Agency mortgage-backed commercial    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 926 335
Debt securities, available-for-sale, unrealized loss, less than 12 months (13) (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
Asset-backed    
Debt Securities [Line Items]    
Debt securities, available-for-sale, fair value, less than 12 months 11 8
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 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 59 71
Debt securities, available-for-sale, unrealized loss, less than 12 months 0 0
Debt securities, available-for-sale, fair value, 12 months or longer 5 41
Debt securities, available-for-sale, unrealized loss, 12 months or longer $ 0 $ (1)