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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, 2020
Dec. 31, 2019
Residential Mortgages    
Cash flows from sales of loans $ 6,654 $ 4,259
Cash flows from repurchases of previously transferred loans 673 321
Cash flows from servicing fees 338 352
Cash flows from servicing advances recovered   45
Cash flows from servicing advances (funded) (32)  
Cash flows on mortgage-backed securities held 9,234 4,362
Carrying value of mortgage-backed securities held 16,500 17,800
Commercial Mortgages    
Cash flows from sales of loans 4,521 3,540
Cash flows from repurchases of previously transferred loans 229 30
Cash flows from servicing fees 133 130
Cash flows from servicing advances recovered   63
Cash flows from servicing advances (funded) (280)  
Cash flows on mortgage-backed securities held 83 84
Carrying value of mortgage-backed securities held $ 800 $ 600