v3.25.4
Mortgage Loans - Credit Quality Indicators - SF (Details) - Single-family - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year $ 292,985 $ 288,639
One fiscal year before 270,785 265,785
Two fiscal years before 223,567 450,253
Three fiscal years before 409,856 1,020,997
Four fiscal years before 940,304 820,495
Prior 1,468,991 812,958
Total mortgage loans 3,606,488 3,659,127
Total writeoffs 723 670
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Current fiscal year, writeoff 5 2
One fiscal year, writeoff 57 44
Two fiscal years, writeoff 94 133
Three fiscal years, writeoff 180 116
Four fiscal years, writeoff 107 72
Prior 280 303
Less than or equal to 80%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 163,343 165,115
One fiscal year before 160,536 169,482
Two fiscal years before 149,624 359,669
Three fiscal years before 337,271 1,000,638
Four fiscal years before 922,745 818,130
Prior 1,465,398 811,170
Total mortgage loans 3,198,917 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 57,484 54,914
One fiscal year before 63,333 67,979
Two fiscal years before 52,872 71,956
Three fiscal years before 53,845 18,388
Four fiscal years before 14,886 2,083
Prior 2,839 1,398
Total mortgage loans 245,259 216,718
Greater than 90% and less than or equal to 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 71,589 68,344
One fiscal year before 44,876 27,646
Two fiscal years before 18,732 16,982
Three fiscal years before 15,552 1,762
Four fiscal years before 2,193 234
Prior 539 233
Total mortgage loans 153,481 115,201
Greater than 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 569 266
One fiscal year before 2,040 678
Two fiscal years before 2,339 1,646
Three fiscal years before 3,188 209
Four fiscal years before 480 48
Prior 215 157
Total mortgage loans 8,831 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 270,116 278,055
One fiscal year before 261,486 256,538
Two fiscal years before 216,159 413,636
Three fiscal years before 378,287 870,282
Four fiscal years before 809,560 716,979
Prior 1,304,902 711,838
Total mortgage loans 3,240,510 3,247,328
Total writeoffs 677 621
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Current fiscal year, writeoff 5 2
One fiscal year, writeoff 56 43
Two fiscal years, writeoff 92 130
Three fiscal years, writeoff 176 114
Four fiscal years, writeoff 106 71
Prior 242 261
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 145,040 156,136
One fiscal year before 152,418 161,237
Two fiscal years before 142,942 324,160
Three fiscal years before 306,573 849,984
Four fiscal years before 792,049 714,620
Prior 1,301,401 710,162
Total mortgage loans 2,840,423 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 54,527 53,904
One fiscal year before 62,451 67,163
Two fiscal years before 52,313 71,059
Three fiscal years before 53,203 18,333
Four fiscal years before 14,848 2,078
Prior 2,790 1,338
Total mortgage loans 240,132 213,875
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 69,983 67,749
One fiscal year before 44,582 27,468
Two fiscal years before 18,590 16,801
Three fiscal years before 15,374 1,757
Four fiscal years before 2,184 233
Prior 517 205
Total mortgage loans 151,230 114,213
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 566 266
One fiscal year before 2,035 670
Two fiscal years before 2,314 1,616
Three fiscal years before 3,137 208
Four fiscal years before 479 48
Prior 194 133
Total mortgage loans 8,725 2,941
15-year or less, amortizing fixed-rate    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 15,837 8,407
One fiscal year before 7,324 6,793
Two fiscal years before 5,288 31,325
Three fiscal years before 26,837 145,266
Four fiscal years before 125,843 102,032
Prior 141,455 75,904
Total mortgage loans 322,584 369,727
Total writeoffs 9 10
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]    
Current fiscal year, writeoff 0 0
One fiscal year, writeoff 1 1
Two fiscal years, writeoff 1 2
Three fiscal years, writeoff 3 2
Four fiscal years, writeoff 1 1
Prior 3 4
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 13,753 7,508
One fiscal year before 6,794 6,455
Two fiscal years before 5,149 31,140
Three fiscal years before 26,742 145,254
Four fiscal years before 125,837 102,032
Prior 141,455 75,904
Total mortgage loans 319,730 368,293
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 1,464 576
One fiscal year before 440 314
Two fiscal years before 127 168
Three fiscal years before 82 11
Four fiscal years before 6 0
Prior 0 0
Total mortgage loans 2,119 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 619 323
One fiscal year before 88 24
Two fiscal years before 11 16
Three fiscal years before 13 1
Four fiscal years before 0 0
Prior 0 0
Total mortgage loans 731 364
15-year or less, amortizing fixed-rate | Greater than 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 1 0
One fiscal year before 2 0
Two fiscal years before 1 1
Three fiscal years before 0 0
Four fiscal years before 0 0
Prior 0 0
Total mortgage loans 4 1
Adjustable-rate    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 7,032 2,177
One fiscal year before 1,975 2,454
Two fiscal years before 2,120 5,292
Three fiscal years before 4,732 5,449
Four fiscal years before 4,901 1,484
Prior 7,846 8,162
Total mortgage loans 28,606 25,018
Total writeoffs 2 2
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 1 1
Three fiscal years, writeoff 1 0
Four fiscal years, writeoff 0 0
Prior 0 1
Adjustable-rate | Less than or equal to 80%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 4,550 1,471
One fiscal year before 1,324 1,790
Two fiscal years before 1,533 4,369
Three fiscal years before 3,956 5,400
Four fiscal years before 4,859 1,478
Prior 7,841 8,159
Total mortgage loans 24,063 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 1,493 434
One fiscal year before 442 502
Two fiscal years before 432 729
Three fiscal years before 560 44
Four fiscal years before 32 5
Prior 4 2
Total mortgage loans 2,963 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 987 272
One fiscal year before 206 154
Two fiscal years before 131 165
Three fiscal years before 165 4
Four fiscal years before 9 1
Prior 1 1
Total mortgage loans 1,499 597
Adjustable-rate | Greater than 100%    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Current fiscal year 2 0
One fiscal year before 3 8
Two fiscal years before 24 29
Three fiscal years before 51 1
Four fiscal years before 1 0
Prior 0 0
Total mortgage loans 81 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 14,788 17,054
Total mortgage loans 14,788 17,054
Total writeoffs 35 37
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 35 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 14,701 16,945
Total mortgage loans 14,701 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 45 58
Total mortgage loans 45 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 21 24
Total mortgage loans 21 24
Government    
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]    
Total mortgage loans 2,800 3,600
Total writeoffs $ 6 $ 47