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Allowance for Loan Losses and Total Recorded Investment in HFI Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans $ (17,289) $ (21,953)    
Allowance for loan losses for collectively reserved loans (1,795) (1,512)    
Total allowance for loan losses (19,084) (23,465) $ (27,951) $ (35,541)
Recorded investment in individually impaired loans 135,781 156,187    
Recorded investment in collectively reserved loans 3,054,194 2,939,629    
Total recorded investment in loans 3,189,975 3,095,816    
Single-Family [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans (17,247) (21,920)    
Allowance for loan losses for collectively reserved loans (1,602) (1,363)    
Total allowance for loan losses (18,849) (23,283) (27,709) (35,177)
Recorded investment in individually impaired loans 135,191 155,598    
Recorded investment in collectively reserved loans 2,787,783 2,708,337    
Total recorded investment in loans 2,922,974 2,863,935    
Multifamily [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses for individually impaired loans (42) (33)    
Allowance for loan losses for collectively reserved loans (193) (149)    
Total allowance for loan losses (235) (182) $ (242) $ (364)
Recorded investment in individually impaired loans 590 589    
Recorded investment in collectively reserved loans 266,411 231,292    
Total recorded investment in loans $ 267,001 $ 231,881