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Mortgage Loans Loans in Mortgage Portfolio (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans $ 3,131,487   $ 3,131,487     $ 3,063,646    
Cost basis and fair value adjustments, net 41,466   41,466     39,572    
Allowance for loan losses for loans held for investment (20,194) $ (22,706) (20,194) $ (22,706) $ (20,399) (23,465) $ (23,799) $ (27,951)
Total mortgage loans 3,152,759   3,152,759     3,079,753    
Carrying value of loans redesignated from HFI to HFS 2,100 652 7,500 2,300        
Carrying value of loans redesignated from HFS to HFI 59   111          
Sale of loans, unpaid principal balance 3,400 $ 1,600 6,500 $ 4,200        
Single-family [Member]                
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 2,878,456   2,878,456     2,833,750    
Recorded investment of single-family mortgage loans referred to foreclosure 14,500   14,500     18,300    
Multifamily [Member]                
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans $ 253,031   $ 253,031     $ 229,896