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Mortgage Loans TDRs (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
contracts
Dec. 31, 2015
USD ($)
contracts
Dec. 31, 2014
USD ($)
contracts
Financing Receivable, Modifications [Line Items]      
Average term extension of a single-family modified loan 157 months 161 months 161 months
Average interest rate reduction of a single-family modified loan 0.79% 0.74% 0.99%
Number of loans troubled debt restructurings activity | contracts 69,811 82,418 119,412
Recorded investment troubled debt restructurings activity | $ $ 9,681 $ 11,487 $ 18,328
Single-Family [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 69,800 82,406 119,393
Recorded investment troubled debt restructurings activity | $ $ 9,615 $ 11,447 $ 17,475
Single-Family [Member] | Primary [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 61,586 71,293 100,956
Recorded investment troubled debt restructurings activity | $ $ 8,405 $ 9,713 $ 14,301
Single-Family [Member] | Government [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 186 241 365
Recorded investment troubled debt restructurings activity | $ $ 20 $ 27 $ 47
Single-Family [Member] | Alt-A [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 6,647 9,037 14,715
Recorded investment troubled debt restructurings activity | $ $ 946 $ 1,374 $ 2,441
Single-Family [Member] | Other [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 1,381 1,835 3,357
Recorded investment troubled debt restructurings activity | $ $ 244 $ 333 $ 686
Multifamily [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 11 12 19
Recorded investment troubled debt restructurings activity | $ $ 66 $ 40 $ 853