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Mortgage Loans TDR (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
contracts
Mar. 31, 2015
USD ($)
contracts
Financing Receivable, Modifications [Line Items]    
Average term extension of a single-family modified loan 157 months 161 months
Average interest rate reduction of a single-family modified loan 0.73% 0.77%
Number of loans troubled debt restructurings activity | contracts 19,554 24,863
Recorded investment troubled debt restructurings activity | $ $ 2,680 $ 3,504
Number of loans troubled debt restructurings subsequent default | contracts 6,571 8,202
Recorded investment troubled debt restructurings subsequent default | $ $ 997 $ 1,279
Single-family [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings activity | contracts 19,554 24,860
Recorded investment troubled debt restructurings activity | $ $ 2,680 $ 3,499
Number of loans troubled debt restructurings subsequent default | contracts 6,571 8,200
Recorded investment troubled debt restructurings subsequent default | $ $ 997 $ 1,275
Single-family [Member] | Primary [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings activity | contracts 17,190 21,407
Recorded investment troubled debt restructurings activity | $ $ 2,332 $ 2,945
Number of loans troubled debt restructurings subsequent default | contracts 5,461 6,723
Recorded investment troubled debt restructurings subsequent default | $ $ 802 $ 1,003
Single-family [Member] | Government [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings activity | contracts 54 74
Recorded investment troubled debt restructurings activity | $ $ 6 $ 8
Number of loans troubled debt restructurings subsequent default | contracts 15 20
Recorded investment troubled debt restructurings subsequent default | $ $ 2 $ 3
Single-family [Member] | Alt-A [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings activity | contracts 1,911 2,789
Recorded investment troubled debt restructurings activity | $ $ 270 $ 438
Number of loans troubled debt restructurings subsequent default | contracts 852 1,153
Recorded investment troubled debt restructurings subsequent default | $ $ 144 $ 203
Single-family [Member] | Other [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings activity | contracts 399 590
Recorded investment troubled debt restructurings activity | $ $ 72 $ 108
Number of loans troubled debt restructurings subsequent default | contracts 243 304
Recorded investment troubled debt restructurings subsequent default | $ $ 49 $ 66
Multifamily [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans troubled debt restructurings activity | contracts 0 3
Recorded investment troubled debt restructurings activity | $ $ 0 $ 5
Number of loans troubled debt restructurings subsequent default | contracts 0 2
Recorded investment troubled debt restructurings subsequent default | $ $ 0 $ 4