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Mortgage Loans TDRs (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]      
Average term extension of a single-family modified loan 153 months 157 months 161 months
Average interest rate reduction of a single-family modified loan 0.56% 0.79% 0.74%
Number of loans troubled debt restructurings activity | contracts 66,414 69,811 82,418
Recorded investment troubled debt restructurings activity | $ $ 9,342 $ 9,681 $ 11,487
Single-Family [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 66,406 69,800 82,406
Recorded investment troubled debt restructurings activity | $ $ 9,243 $ 9,615 $ 11,447
Single-Family [Member] | Primary [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 59,708 61,586 71,293
Recorded investment troubled debt restructurings activity | $ $ 8,247 $ 8,405 $ 9,713
Single-Family [Member] | Government [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 171 186 241
Recorded investment troubled debt restructurings activity | $ $ 18 $ 20 $ 27
Single-Family [Member] | Alt-A [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 5,369 6,647 9,037
Recorded investment troubled debt restructurings activity | $ $ 771 $ 946 $ 1,374
Single-Family [Member] | Other [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 1,158 1,381 1,835
Recorded investment troubled debt restructurings activity | $ $ 207 $ 244 $ 333
Multifamily [Member]      
Financing Receivable, Modifications [Line Items]      
Number of loans troubled debt restructurings activity | contracts 8 11 12
Recorded investment troubled debt restructurings activity | $ $ 99 $ 66 $ 40