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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, 2019
Mar. 31, 2018
Dec. 31, 2018
Residential Mortgage [Member]      
Cash flows from sales of loans $ 715 $ 1,193  
Cash flows from repurchases of previously transferred loans 93 119  
Cash flows from servicing fees 87 92  
Cash flows from servicing advances recovered (funded), net 18 4  
Cash flows on mortgage-backed securities held 507 422  
Carrying value of mortgage-backed securities held 14,600 9,400 $ 13,300
Commercial Mortgages [Member]      
Cash flows from sales of loans 644 1,202  
Cash flows from repurchases of previously transferred loans  
Cash flows from servicing fees 30 31  
Cash flows from servicing advances recovered (funded), net (23) 17  
Cash flows on mortgage-backed securities held 14 21  
Carrying value of mortgage-backed securities held $ 600 $ 700 $ 600