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Investment Securities (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Investment securities available-for-sale, Amortized Cost $ 14,758 $ 12,313
Investment securities available-for-sale, Fair Value 15,090 12,398
Carrying value of securities pledged 5,300  
Pledged to the FHLB as collateral for potential future borrowings 4,800  
FHLB potential future borrowings 4,600  
Collateral for potential future borrowings 522  
Liabilities secured by pledged collateral 439  
U.S. Treasury and other U.S. government agency securities    
Investment securities available-for-sale, Amortized Cost 4,590 2,745
Investment securities available-for-sale, Fair Value 4,683 2,792
Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost [1] 10,168 9,568
Investment securities available-for-sale, Fair Value [1] 10,407 9,606
Debt securities    
Investment securities available-for-sale, Amortized Cost 14,758  
Investment securities available-for-sale, Fair Value 15,090  
Prepayment options | Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost 10,200  
Investment securities available-for-sale, Fair Value [1] 10,400  
Available-for-sale Securities [Member]    
Interest receivable $ 19 $ 20
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.