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Investment Securities (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Schedule of Investments [Line Items]      
Net unsettled investment purchases (less than $0.1 billion for 9/30/23) $ 100   $ 2,000
Investment securities, allowance for credit loss 98 $ 149  
Pretax loss included in AOCI from derivatives (297)   $ (132)
Federal National Mortgage Association Certificates and Obligations (FNMA)      
Schedule of Investments [Line Items]      
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity 38,100    
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity 33,400    
Federal Home Loan Mortgage Corporation (FHLMC) Insured Loans      
Schedule of Investments [Line Items]      
Debt securities amortized cost amount of debt securities exceeds 10 percent of shareholders equity 32,400    
Fair value of debt securities of a single issuer that exceeds 10 percent of shareholders equity $ 28,700