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Investment Securities (Narrative) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Securities with no credit impairment in unrealized loss position 139  
Interest receivable $ 20 $ 18
Investment securities available-for-sale, Amortized Cost 15,745 14,752
Investment securities available-for-sale, Fair Value 15,837 15,028
Carrying value of securities pledged 4,000  
Pledged to the FHLB as collateral for potential future borrowings 3,200  
FHLB potential future borrowings 3,100  
Collateral for potential future borrowings 830  
Liabilities secured by pledged collateral $ 631  
U.S. Treasury and other U.S. government agency securities    
Securities with no credit impairment in unrealized loss position 19  
Investment securities available-for-sale, Amortized Cost $ 3,821 4,583
Investment securities available-for-sale, Fair Value $ 3,844 4,658
Residential mortgage-backed securities    
Securities with no credit impairment in unrealized loss position 120  
Investment securities available-for-sale, Amortized Cost [1] $ 11,924 10,169
Investment securities available-for-sale, Fair Value [1] 11,993 $ 10,370
Debt securities    
Investment securities available-for-sale, Amortized Cost 15,745  
Investment securities available-for-sale, Fair Value 15,837  
Prepayment options | Residential mortgage-backed securities    
Investment securities available-for-sale, Amortized Cost 11,900  
Investment securities available-for-sale, Fair Value $ 12,000  
[1] Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.