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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
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Residential mortgage loans held for sale      
Cash flows from sales of loans $ 1,239 $ 1,334  
Cash flows from repurchases of previously transferred loans 93 95  
Cash flows from servicing fees 82 85  
Cash flows from servicing advances recovered/(funded), net 17 12  
Cash flows on mortgage-backed securities held 2,555 1,361  
Carrying value of mortgage-backed securities held 15,400 17,100 $ 16,500
Commercial mortgage loans held for sale      
Cash flows from sales of loans 988 493  
Cash flows from repurchases of previously transferred loans 33 15  
Cash flows from servicing fees 38 33  
Cash flows from servicing advances recovered/(funded), net (10) 12  
Cash flows on mortgage-backed securities held 29 37  
Carrying value of mortgage-backed securities held $ 800 $ 800 $ 800