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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, 2020
Mar. 31, 2019
Dec. 31, 2019
Residential Mortgage [Member]      
Cash flows from sales of loans $ 1,334 $ 715  
Cash flows from repurchases of previously transferred loans 95 93  
Cash flows from servicing fees 85 87  
Cash flows from servicing advances recovered/(funded), net 12 18  
Cash flows on mortgage-backed securities held 1,361 507  
Carrying value of mortgage-backed securities held 17,100 14,600 $ 17,800
Commercial Mortgages [Member]      
Cash flows from sales of loans 493 644  
Cash flows from repurchases of previously transferred loans 15    
Cash flows from servicing fees 33 30  
Cash flows from servicing advances recovered/(funded), net 12 (23)  
Cash flows on mortgage-backed securities held 37 14  
Carrying value of mortgage-backed securities held $ 800 $ 600 $ 600