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Mortgage Loans Loans in Mortgage Portfolio (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans $ 3,093,430   $ 3,063,646  
Cost basis and fair value adjustments, net 38,201   39,572  
Allowance for loan losses for loans held for investment (22,129) $ (25,819) (23,465) $ (27,951)
Total mortgage loans 3,109,502   3,079,753  
Carrying value of loans redesignated from HFI to HFS 2,500 596    
Carrying value of loans redesignated from HFS to HFI 35      
Sale of loans, unpaid principal balance 93 $ 1,100    
Single-family [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans 2,852,739   2,833,750  
Recorded investment of single-family mortgage loans referred to foreclosure 17,100   18,300  
Multifamily [Member]        
Loans in Mortgage Portfolio [Line Items]        
Unpaid principal balance of mortgage loans $ 240,691   $ 229,896