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Investment Securities (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Securities with no credit impairment in unrealized loss position 170               170    
Repositioning lower-yielding treasury securities                 $ 1,000 $ 1,300  
Net securities losses $ 1 $ 0 $ 0 $ (8) $ 0 $ (20) $ 1 $ 0 (7) (19) $ 0
Investment securities available-for-sale, Amortized Cost 12,313       12,225       12,313 12,225  
Carrying value of securities pledged 518               518    
Liabilities secured by pledged collateral 418               418    
U.S. Treasury and other U.S. government agency securities                      
Investment securities available-for-sale, Amortized Cost 2,745       2,732       2,745 2,732  
Residential mortgage-backed securities                      
Investment securities available-for-sale, Amortized Cost [1] 9,568       $ 9,493       9,568 $ 9,493  
Debt securities                      
Investment securities available-for-sale, Amortized Cost 12,313               12,313    
Prepayment options | Residential mortgage-backed securities                      
Investment securities available-for-sale, Amortized Cost $ 9,600               $ 9,600    
[1]
Issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.