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Mortgage Loans TDRs with Sub Defaults (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
contracts
Mar. 31, 2016
USD ($)
contracts
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings subsequent default | contracts 5,314 6,571
Recorded investment troubled debt restructurings subsequent default | $ $ 761 $ 997
Single-family [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings subsequent default | contracts 5,313 6,571
Recorded investment troubled debt restructurings subsequent default | $ $ 757 $ 997
Single-family [Member] | Primary [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings subsequent default | contracts 4,479 5,461
Recorded investment troubled debt restructurings subsequent default | $ $ 621 $ 802
Single-family [Member] | Government [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings subsequent default | contracts 19 15
Recorded investment troubled debt restructurings subsequent default | $ $ 2 $ 2
Single-family [Member] | Alt-A [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings subsequent default | contracts 614 852
Recorded investment troubled debt restructurings subsequent default | $ $ 96 $ 144
Single-family [Member] | Other [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings subsequent default | contracts 201 243
Recorded investment troubled debt restructurings subsequent default | $ $ 38 $ 49
Multifamily [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings subsequent default | contracts 1 0
Recorded investment troubled debt restructurings subsequent default | $ $ 4 $ 0