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Investment Securities (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investment securities available-for-sale, Amortized Cost $ 12,633 $ 12,313
Investment securities available-for-sale, Fair Value 13,041 12,398
Carrying value of securities pledged 6,200  
Pledged to the FHLB as collateral for potential future borrowings 5,500  
FHLB potential future borrowings 5,200  
Collateral for potential future borrowings 675  
Liabilities secured by pledged collateral 510  
U.S. Treasury and other U.S. government agency securities    
Investment securities available-for-sale, Amortized Cost 2,746 2,745
Investment securities available-for-sale, Fair Value 2,864 2,792
Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost [1] 9,887 9,568
Investment securities available-for-sale, Fair Value [1] 10,177 9,606
Debt securities    
Investment securities available-for-sale, Amortized Cost 12,633  
Investment securities available-for-sale, Fair Value 13,041  
Prepayment options | Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost 9,900  
Investment securities available-for-sale, Fair Value [1] 10,200  
Available-for-sale Securities [Member]    
Interest receivable $ 20 $ 20
[1]
Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.