v3.25.2
Mortgage Loans - Credit Quality Indicators - SF (Details) - Single-family - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year $ 119,253 $ 288,639
One fiscal year before 298,617 265,785
Two fiscal years before 248,614 450,253
Three fiscal years before 430,834 1,020,997
Four fiscal years before 981,564 820,495
Prior 1,551,615 812,958
Total mortgage loans 3,630,497 3,659,127
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Current fiscal year, writeoff 0 2
One fiscal year, writeoff 19 44
Two fiscal years, writeoff 41 133
Three fiscal years, writeoff 88 116
Four fiscal years, writeoff 51 72
Prior 147 303
Total writeoff 346 670
Less than or equal to 80%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 74,142 165,115
One fiscal year before 186,183 169,482
Two fiscal years before 172,615 359,669
Three fiscal years before 364,430 1,000,638
Four fiscal years before 968,517 818,130
Prior 1,548,169 811,170
Total mortgage loans 3,314,056 3,324,204
Greater than 80% and less than or equal to 90%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 18,486 54,914
One fiscal year before 67,806 67,979
Two fiscal years before 61,051 71,956
Three fiscal years before 54,236 18,388
Four fiscal years before 11,460 2,083
Prior 2,874 1,398
Total mortgage loans 215,913 216,718
Greater than 90% and less than or equal to 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 26,624 68,344
One fiscal year before 44,153 27,646
Two fiscal years before 14,142 16,982
Three fiscal years before 10,642 1,762
Four fiscal years before 1,388 234
Prior 385 233
Total mortgage loans 97,334 115,201
Greater than 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 1 266
One fiscal year before 475 678
Two fiscal years before 806 1,646
Three fiscal years before 1,526 209
Four fiscal years before 199 48
Prior 187 157
Total mortgage loans 3,194 3,004
20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 111,833 278,055
One fiscal year before 287,929 256,538
Two fiscal years before 240,261 413,636
Three fiscal years before 396,744 870,282
Four fiscal years before 840,836 716,979
Prior 1,367,833 711,838
Total mortgage loans 3,245,436 3,247,328
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Current fiscal year, writeoff 0 2
One fiscal year, writeoff 19 43
Two fiscal years, writeoff 40 130
Three fiscal years, writeoff 85 114
Four fiscal years, writeoff 50 71
Prior 120 261
Total writeoff 314 621
20- and 30-year or more, amortizing fixed-rate | Less than or equal to 80%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 67,747 156,136
One fiscal year before 176,742 161,237
Two fiscal years before 164,943 324,160
Three fiscal years before 331,096 849,984
Four fiscal years before 827,820 714,620
Prior 1,364,477 710,162
Total mortgage loans 2,932,825 2,916,299
20- and 30-year or more, amortizing fixed-rate | Greater than 80% and less than or equal to 90%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 17,824 53,904
One fiscal year before 66,837 67,163
Two fiscal years before 60,483 71,059
Three fiscal years before 53,627 18,333
Four fiscal years before 11,436 2,078
Prior 2,826 1,338
Total mortgage loans 213,033 213,875
20- and 30-year or more, amortizing fixed-rate | Greater than 90% and less than or equal to 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 26,261 67,749
One fiscal year before 43,876 27,468
Two fiscal years before 14,036 16,801
Three fiscal years before 10,517 1,757
Four fiscal years before 1,382 233
Prior 363 205
Total mortgage loans 96,435 114,213
20- and 30-year or more, amortizing fixed-rate | Greater than 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 1 266
One fiscal year before 474 670
Two fiscal years before 799 1,616
Three fiscal years before 1,504 208
Four fiscal years before 198 48
Prior 167 133
Total mortgage loans 3,143 2,941
15-year or less, amortizing fixed-rate    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 5,723 8,407
One fiscal year before 8,506 6,793
Two fiscal years before 6,049 31,325
Three fiscal years before 29,072 145,266
Four fiscal years before 135,553 102,032
Prior 159,233 75,904
Total mortgage loans 344,136 369,727
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Current fiscal year, writeoff 0 0
One fiscal year, writeoff 0 1
Two fiscal years, writeoff 1 2
Three fiscal years, writeoff 2 2
Four fiscal years, writeoff 1 1
Prior 2 4
Total writeoff 6 10
15-year or less, amortizing fixed-rate | Less than or equal to 80%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 5,095 7,508
One fiscal year before 7,838 6,455
Two fiscal years before 5,876 31,140
Three fiscal years before 28,986 145,254
Four fiscal years before 135,549 102,032
Prior 159,233 75,904
Total mortgage loans 342,577 368,293
15-year or less, amortizing fixed-rate | Greater than 80% and less than or equal to 90%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 401 576
One fiscal year before 537 314
Two fiscal years before 165 168
Three fiscal years before 75 11
Four fiscal years before 4 0
Prior 0 0
Total mortgage loans 1,182 1,069
15-year or less, amortizing fixed-rate | Greater than 90% and less than or equal to 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 227 323
One fiscal year before 131 24
Two fiscal years before 8 16
Three fiscal years before 10 1
Four fiscal years before 0 0
Prior 0 0
Total mortgage loans 376 364
15-year or less, amortizing fixed-rate | Greater than 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 0 0
One fiscal year before 0 0
Two fiscal years before 0 1
Three fiscal years before 1 0
Four fiscal years before 0 0
Prior 0 0
Total mortgage loans 1 1
Adjustable-rate    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 1,697 2,177
One fiscal year before 2,182 2,454
Two fiscal years before 2,304 5,292
Three fiscal years before 5,018 5,449
Four fiscal years before 5,175 1,484
Prior 8,685 8,162
Total mortgage loans 25,061 25,018
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Current fiscal year, writeoff 0 0
One fiscal year, writeoff 0 0
Two fiscal years, writeoff 0 1
Three fiscal years, writeoff 1 0
Four fiscal years, writeoff 0 0
Prior 0 1
Total writeoff 1 2
Adjustable-rate | Less than or equal to 80%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 1,300 1,471
One fiscal year before 1,603 1,790
Two fiscal years before 1,796 4,369
Three fiscal years before 4,348 5,400
Four fiscal years before 5,148 1,478
Prior 8,679 8,159
Total mortgage loans 22,874 22,667
Adjustable-rate | Greater than 80% and less than or equal to 90%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 261 434
One fiscal year before 432 502
Two fiscal years before 403 729
Three fiscal years before 534 44
Four fiscal years before 20 5
Prior 5 2
Total mortgage loans 1,655 1,716
Adjustable-rate | Greater than 90% and less than or equal to 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 136 272
One fiscal year before 146 154
Two fiscal years before 98 165
Three fiscal years before 115 4
Four fiscal years before 6 1
Prior 1 1
Total mortgage loans 502 597
Adjustable-rate | Greater than 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 0 0
One fiscal year before 1 8
Two fiscal years before 7 29
Three fiscal years before 21 1
Four fiscal years before 1 0
Prior 0 0
Total mortgage loans 30 38
Other    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 0 0
One fiscal year before 0 0
Two fiscal years before 0 0
Three fiscal years before 0 0
Four fiscal years before 0 0
Prior 15,864 17,054
Total mortgage loans 15,864 17,054
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Current fiscal year, writeoff 0 0
One fiscal year, writeoff 0 0
Two fiscal years, writeoff 0 0
Three fiscal years, writeoff 0 0
Four fiscal years, writeoff 0 0
Prior 25 37
Total writeoff 25 37
Other | Less than or equal to 80%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 0 0
One fiscal year before 0 0
Two fiscal years before 0 0
Three fiscal years before 0 0
Four fiscal years before 0 0
Prior 15,780 16,945
Total mortgage loans 15,780 16,945
Other | Greater than 80% and less than or equal to 90%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 0 0
One fiscal year before 0 0
Two fiscal years before 0 0
Three fiscal years before 0 0
Four fiscal years before 0 0
Prior 43 58
Total mortgage loans 43 58
Other | Greater than 90% and less than or equal to 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 0 0
One fiscal year before 0 0
Two fiscal years before 0 0
Three fiscal years before 0 0
Four fiscal years before 0 0
Prior 21 27
Total mortgage loans 21 27
Other | Greater than 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 0 0
One fiscal year before 0 0
Two fiscal years before 0 0
Three fiscal years before 0 0
Four fiscal years before 0 0
Prior 20 24
Total mortgage loans 20 24
U.S Government    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Total mortgage loans 3,100 3,600
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Total writeoff $ 4 $ 47