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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, 2018
Dec. 31, 2017
Residential Mortgage    
Cash flows from sales of loans $ 4,474 $ 5,759
Cash flows from repurchases of previously transferred loans 393 464
Cash flows from servicing fees 362 374
Cash flows from servicing advances recovered 45 101
Cash flows on mortgage-backed securities held 1,964 1,527
Carrying value of mortgage-backed securities held 13,300 8,800
Commercial Mortgage    
Cash flows from sales of loans 4,140 5,276
Cash flows from repurchases of previously transferred loans 32  
Cash flows from servicing fees 135 126
Cash flows from servicing advances recovered   48
Cash flows from servicing advances (funded) (3)  
Cash flows on mortgage-backed securities held 109 206
Carrying value of mortgage-backed securities held $ 600 $ 600