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Loan Sale and Servicing Activities and Variable Interest Entities (Cash Flows Associated with Loan Sale and Servicing Activities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Residential Mortgages    
Cash flows from sales of loans $ 2,648 $ 5,124
Cash flows from repurchases of previously transferred loans 87 187
Cash flows from servicing fees 529 405
Cash flows from servicing advances (funded) 7 11
Cash flows on mortgage-backed securities held 2,624 3,790
Carrying value of mortgage-backed securities held 20,400 21,400
Commercial Mortgages    
Cash flows from sales of loans 3,650 3,332
Cash flows from repurchases of previously transferred loans 27
Cash flows from servicing fees 198 190
Cash flows from servicing advances (funded) 140 42
Cash flows on mortgage-backed securities held 75 84
Carrying value of mortgage-backed securities held $ 700 $ 700