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Mortgage Loans - TDRs (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Average term extension of a single-family modified loan 145 months 163 months 162 months
Average interest rate reduction of a single-family modified loan 0.57% 0.37% 0.13%
Number of loans troubled debt restructurings activity | contract 12,620 35,049 51,870
Amortized cost troubled debt restructurings activity | $ $ 1,883 $ 5,665 $ 8,146
Single-family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans troubled debt restructurings activity | contract 12,620 35,049 51,859
Amortized cost troubled debt restructurings activity | $ $ 1,883 $ 5,665 $ 8,090
Single-family | 20- and 30-year or more, amortizing fixed-rate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans troubled debt restructurings activity | contract 10,815 29,938 43,283
Amortized cost troubled debt restructurings activity | $ $ 1,717 $ 5,125 $ 7,140
Single-family | 15-year or less, amortizing fixed-rate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans troubled debt restructurings activity | contract 1,165 2,956 4,762
Amortized cost troubled debt restructurings activity | $ $ 93 $ 257 $ 424
Single-family | Adjustable-rate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans troubled debt restructurings activity | contract 116 467 813
Amortized cost troubled debt restructurings activity | $ $ 17 $ 72 $ 123
Single-family | Other      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans troubled debt restructurings activity | contract 524 1,688 3,001
Amortized cost troubled debt restructurings activity | $ $ 56 $ 211 $ 403
Multifamily      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans troubled debt restructurings activity | contract 0 0 11
Amortized cost troubled debt restructurings activity | $ $ 0 $ 0 $ 56