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Mortgage Loans Loans in Mortgage Portfolio (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans $ 3,209,155   $ 3,209,155     $ 3,155,703    
Cost basis and fair value adjustments, net 39,642   39,642     41,906    
Allowance for loan losses for loans held for investment (15,663) $ (20,194) (15,663) $ (20,194) $ (16,812) (19,084) $ (20,399) $ (23,465)
Total mortgage loans 3,233,134   3,233,134     3,178,525    
Carrying value of loans redesignated from HFI to HFS 4,249 2,077 17,851 7,499        
Carrying value of loans redesignated from HFS to HFI 6 59 36 111        
Loans sold - unpaid principal balance 9,373 3,433 13,831 6,473        
Realized gains on sale of mortgage loans 93 $ 158 301 $ 211        
Single-family [Member]                
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans 2,924,857   2,924,857     2,890,634    
Mortgage Loans in Process of Foreclosure, Amount 10,600   10,600     13,000    
Multifamily [Member]                
Loans in Mortgage Portfolio [Line Items]                
Unpaid principal balance of mortgage loans $ 284,298   $ 284,298     $ 265,069