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Loan Sale and Servicing Activities and Variable Interest Entities (Principal Balance, Delinquent Loans ,and Net Charge-Offs Related to Serviced Loans For Others) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Residential Mortgages    
Total principal balance $ 39,016 $ 41,031
Delinquent loans 329 346
Net charge-offs 4 4
Commercial Mortgages    
Total principal balance 57,492 57,974
Delinquent loans 89
Net charge-offs $ 26 $ 74