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Mortgage Loans TDRs with Sub Defaults (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
contracts
Dec. 31, 2016
USD ($)
contracts
Dec. 31, 2015
USD ($)
contracts
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings subsequent default | contracts 22,980 25,043 31,684
Recorded investment troubled debt restructurings subsequent default | $ $ 3,289 $ 3,667 $ 4,783
Single-Family [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings subsequent default | contracts 22,978 25,038 31,681
Recorded investment troubled debt restructurings subsequent default | $ $ 3,277 $ 3,621 $ 4,777
Single-Family [Member] | Primary [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings subsequent default | contracts 19,539 20,810 26,206
Recorded investment troubled debt restructurings subsequent default | $ $ 2,722 $ 2,938 $ 3,808
Single-Family [Member] | Government [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings subsequent default | contracts 91 95 118
Recorded investment troubled debt restructurings subsequent default | $ $ 10 $ 11 $ 16
Single-Family [Member] | Alt-A [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings subsequent default | contracts 2,588 3,131 4,128
Recorded investment troubled debt restructurings subsequent default | $ $ 400 $ 500 $ 706
Single-Family [Member] | Other [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings subsequent default | contracts 760 1,002 1,229
Recorded investment troubled debt restructurings subsequent default | $ $ 145 $ 172 $ 247
Multifamily [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings subsequent default | contracts 2 5 3
Recorded investment troubled debt restructurings subsequent default | $ $ 12 $ 46 $ 6