v3.26.1
Mortgage Loans - Amortized Cost Basis of Single-Family Held-for-Investment Loans by Current LTV Ratios and Vintage (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year, year-to-date write-offs $ 0 $ 1
Fiscal year before current fiscal year, year-to-date write-offs 2 22
Two years before current fiscal Year, year-to-date write-offs 17 44
Three years before current fiscal year, year-to-date write-offs 28 75
Four years before current fiscal year, year-to-date write-offs 37 55
More than five years before current fiscal Year, year-to-date write-offs 42 174
Financing Receivable, before Allowance for Credit Loss 3,303,409 3,291,359
Total current-period year-to-date gross write-offs 126 371
20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 57,207 304,494
Current fiscal year, year-to-date write-offs 0 1
One year before current fiscal year 321,711 279,055
Fiscal year before current fiscal year, year-to-date write-offs 2 22
Two years before current fiscal year 260,442 202,824
Two years before current fiscal Year, year-to-date write-offs 17 44
Three years before current fiscal year 190,803 332,168
Three years before current fiscal year, year-to-date write-offs 28 73
Four years before current fiscal year 324,792 747,411
Four years before current fiscal year, year-to-date write-offs 36 54
Five years before current fiscal year 1,693,828 978,660
More than five years before current fiscal Year, year-to-date write-offs 41 172
Financing Receivable, before Allowance for Credit Loss 2,848,783 2,844,612
Total current-period year-to-date gross write-offs 124 366
15-year or less, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 5,017 22,385
Current fiscal year, year-to-date write-offs 0 0
One year before current fiscal year 23,293 10,842
Fiscal year before current fiscal year, year-to-date write-offs 0 0
Two years before current fiscal year 10,052 5,987
Two years before current fiscal Year, year-to-date write-offs 0 0
Three years before current fiscal year 5,553 21,769
Three years before current fiscal year, year-to-date write-offs 0 1
Four years before current fiscal year 20,937 96,294
Four years before current fiscal year, year-to-date write-offs 1 1
Five years before current fiscal year 198,405 111,404
More than five years before current fiscal Year, year-to-date write-offs 1 1
Financing Receivable, before Allowance for Credit Loss 263,257 268,681
Total current-period year-to-date gross write-offs 2 3
Adjustable-rate and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,998 9,215
Current fiscal year, year-to-date write-offs 0 0
One year before current fiscal year 10,142 2,031
Fiscal year before current fiscal year, year-to-date write-offs 0 0
Two years before current fiscal year 1,930 2,342
Two years before current fiscal Year, year-to-date write-offs 0 0
Three years before current fiscal year 2,249 4,616
Three years before current fiscal year, year-to-date write-offs 0 1
Four years before current fiscal year 4,485 3,632
Four years before current fiscal year, year-to-date write-offs 0 0
Five years before current fiscal year 13,773 10,637
More than five years before current fiscal Year, year-to-date write-offs 0 1
Financing Receivable, before Allowance for Credit Loss 34,577 32,473
Total current-period year-to-date gross write-offs 0 2
Single family    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 64,222 336,094
One year before current fiscal year 355,146 291,928
Two years before current fiscal year 272,424 211,153
Three years before current fiscal year 198,605 358,553
Four years before current fiscal year 350,214 847,337
Five years before current fiscal year 1,906,006 1,100,701
Financing Receivable, before Allowance for Credit Loss 3,146,617 3,145,766
CLTV ratio less than or equal to 60 percent | 20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 8,698 47,112
One year before current fiscal year 50,304 47,188
Two years before current fiscal year 44,393 39,388
Three years before current fiscal year 37,527 114,149
Four years before current fiscal year 114,041 557,834
Five years before current fiscal year 1,473,337 936,838
Financing Receivable, before Allowance for Credit Loss 1,728,300 1,742,509
CLTV ratio less than or equal to 60 percent | 15-year or less, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,921 9,953
One year before current fiscal year 10,706 5,816
Two years before current fiscal year 5,535 3,987
Three years before current fiscal year 3,824 19,872
Four years before current fiscal year 19,373 96,005
Five years before current fiscal year 198,169 111,387
Financing Receivable, before Allowance for Credit Loss 239,528 247,020
CLTV ratio less than or equal to 60 percent | Adjustable-rate and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 367 1,797
One year before current fiscal year 1,937 358
Two years before current fiscal year 337 412
Three years before current fiscal year 401 1,753
Four years before current fiscal year 1,723 3,121
Five years before current fiscal year 13,138 10,469
Financing Receivable, before Allowance for Credit Loss 17,903 17,910
CLTV ratio less than or equal to 60 percent | Single family    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 10,986 58,862
One year before current fiscal year 62,947 53,362
Two years before current fiscal year 50,265 43,787
Three years before current fiscal year 41,752 135,774
Four years before current fiscal year 135,137 656,960
Five years before current fiscal year 1,684,644 1,058,694
Financing Receivable, before Allowance for Credit Loss 1,985,731 2,007,439
CLTV ratio greater than 60 to 80 percent | 20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 24,341 118,639
One year before current fiscal year 121,494 110,794
Two years before current fiscal year 103,454 95,194
Three years before current fiscal year 89,654 162,477
Four years before current fiscal year 157,726 179,033
Five years before current fiscal year 208,915 40,311
Financing Receivable, before Allowance for Credit Loss 705,584 706,448
CLTV ratio greater than 60 to 80 percent | 15-year or less, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 2,222 9,450
One year before current fiscal year 9,611 4,281
Two years before current fiscal year 3,903 1,879
Three years before current fiscal year 1,636 1,833
Four years before current fiscal year 1,513 286
Five years before current fiscal year 235 17
Financing Receivable, before Allowance for Credit Loss 19,120 17,746
CLTV ratio greater than 60 to 80 percent | Adjustable-rate and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 976 4,321
One year before current fiscal year 4,578 923
Two years before current fiscal year 886 1,184
Three years before current fiscal year 1,125 2,138
Four years before current fiscal year 2,055 489
Five years before current fiscal year 603 155
Financing Receivable, before Allowance for Credit Loss 10,223 9,210
CLTV ratio greater than 60 to 80 percent | Single family    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 27,539 132,410
One year before current fiscal year 135,683 115,998
Two years before current fiscal year 108,243 98,257
Three years before current fiscal year 92,415 166,448
Four years before current fiscal year 161,294 179,808
Five years before current fiscal year 209,753 40,483
Financing Receivable, before Allowance for Credit Loss 734,927 733,404
CLTV ratio greater than 80 to 90 Percent | 20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 11,704 60,372
One year before current fiscal year 66,473 67,451
Two years before current fiscal year 62,480 50,223
Three years before current fiscal year 46,818 43,480
Four years before current fiscal year 41,470 9,002
Five years before current fiscal year 9,799 1,135
Financing Receivable, before Allowance for Credit Loss 238,744 231,663
CLTV ratio greater than 80 to 90 Percent | 15-year or less, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 609 1,967
One year before current fiscal year 2,013 639
Two years before current fiscal year 545 105
Three years before current fiscal year 83 57
Four years before current fiscal year 44 3
Five years before current fiscal year 1 0
Financing Receivable, before Allowance for Credit Loss 3,295 2,771
CLTV ratio greater than 80 to 90 Percent | Adjustable-rate and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 386 1,783
One year before current fiscal year 2,046 522
Two years before current fiscal year 495 581
Three years before current fiscal year 562 574
Four years before current fiscal year 556 19
Five years before current fiscal year 26 9
Financing Receivable, before Allowance for Credit Loss 4,071 3,488
CLTV ratio greater than 80 to 90 Percent | Single family    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 12,699 64,122
One year before current fiscal year 70,532 68,612
Two years before current fiscal year 63,520 50,909
Three years before current fiscal year 47,463 44,111
Four years before current fiscal year 42,070 9,024
Five years before current fiscal year 9,826 1,144
Financing Receivable, before Allowance for Credit Loss 246,110 237,922
CLTV ratio greater than 90 to 100 percent | 20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 12,397 77,814
One year before current fiscal year 82,702 51,196
Two years before current fiscal year 47,792 16,197
Three years before current fiscal year 14,915 10,399
Four years before current fiscal year 9,725 1,386
Five years before current fiscal year 1,533 292
Financing Receivable, before Allowance for Credit Loss 169,064 157,284
CLTV ratio greater than 90 to 100 percent | 15-year or less, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 262 1,007
One year before current fiscal year 955 104
Two years before current fiscal year 68 15
Three years before current fiscal year 10 7
Four years before current fiscal year 7 0
Five years before current fiscal year 0 0
Financing Receivable, before Allowance for Credit Loss 1,302 1,133
CLTV ratio greater than 90 to 100 percent | Adjustable-rate and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 269 1,312
One year before current fiscal year 1,577 226
Two years before current fiscal year 209 153
Three years before current fiscal year 145 132
Four years before current fiscal year 128 3
Five years before current fiscal year 5 2
Financing Receivable, before Allowance for Credit Loss 2,333 1,828
CLTV ratio greater than 90 to 100 percent | Single family    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 12,928 80,133
One year before current fiscal year 85,234 51,526
Two years before current fiscal year 48,069 16,365
Three years before current fiscal year 15,070 10,538
Four years before current fiscal year 9,860 1,389
Five years before current fiscal year 1,538 294
Financing Receivable, before Allowance for Credit Loss 172,699 160,245
CLTV ratio greater than 100 percent | 20- and 30-year or more, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 67 557
One year before current fiscal year 738 2,426
Two years before current fiscal year 2,323 1,822
Three years before current fiscal year 1,889 1,663
Four years before current fiscal year 1,830 156
Five years before current fiscal year 244 84
Financing Receivable, before Allowance for Credit Loss 7,091 6,708
CLTV ratio greater than 100 percent | 15-year or less, amortizing fixed-rate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 3 8
One year before current fiscal year 8 2
Two years before current fiscal year 1 1
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Five years before current fiscal year 0 0
Financing Receivable, before Allowance for Credit Loss 12 11
CLTV ratio greater than 100 percent | Adjustable-rate and other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 2
One year before current fiscal year 4 2
Two years before current fiscal year 3 12
Three years before current fiscal year 16 19
Four years before current fiscal year 23 0
Five years before current fiscal year 1 2
Financing Receivable, before Allowance for Credit Loss 47 37
CLTV ratio greater than 100 percent | Single family    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 70 567
One year before current fiscal year 750 2,430
Two years before current fiscal year 2,327 1,835
Three years before current fiscal year 1,905 1,682
Four years before current fiscal year 1,853 156
Five years before current fiscal year 245 86
Financing Receivable, before Allowance for Credit Loss $ 7,150 $ 6,756