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Allowance for Loan Losses and Total Recorded Investment in HFI Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans $ (12,335) $ (13,295)    
Allowance for loan losses for collectively reserved loans (897) (908)    
Total allowance for loan losses (13,232) (14,203) $ (18,734) $ (19,084)
Recorded investment in individually impaired loans 114,882 118,103    
Recorded investment in collectively reserved loans 3,147,934 3,137,065    
Total recorded investment in loans 3,262,816 3,255,168    
Single-family [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans (12,291) (13,255)    
Allowance for loan losses for collectively reserved loans (694) (714)    
Total allowance for loan losses (12,985) (13,969) (18,523) (18,849)
Recorded investment in individually impaired loans 114,223 117,561    
Recorded investment in collectively reserved loans 2,844,196 2,841,943    
Total recorded investment in loans 2,958,419 2,959,504    
Multifamily [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans (44) (40)    
Allowance for loan losses for collectively reserved loans (203) (194)    
Total allowance for loan losses (247) (234) $ (211) $ (235)
Recorded investment in individually impaired loans 659 542    
Recorded investment in collectively reserved loans 303,738 295,122    
Total recorded investment in loans $ 304,397 $ 295,664