v3.26.1
Concentration of Credit and Other Risks - Concentration of Credit Risk - Single-Family Mortgage Portfolio (Details)
$ in Millions
Jun. 30, 2026
USD ($)
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.60%
West  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.47%
Northeast  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.63%
Southeast  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.69%
Southwest  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.64%
North Central  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.60%
California  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.46%
Texas  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.72%
Florida  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.83%
New York  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.82%
Illinois  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.72%
All Other  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.57%
Geographic Concentration Risk | All Other  
Concentration Risk [Line Items]  
Portfolio UPB $ 1,960,734
Concentration risk percentage 62.00%
Geographic Concentration Risk | Single-family UPB  
Concentration Risk [Line Items]  
Portfolio UPB $ 3,172,006
Concentration risk percentage 100.00%
Geographic Concentration Risk | Single-family UPB | West  
Concentration Risk [Line Items]  
Portfolio UPB $ 922,030
Concentration risk percentage 29.00%
Geographic Concentration Risk | Single-family UPB | Northeast  
Concentration Risk [Line Items]  
Portfolio UPB $ 732,103
Concentration risk percentage 23.00%
Geographic Concentration Risk | Single-family UPB | Southeast  
Concentration Risk [Line Items]  
Portfolio UPB $ 569,212
Concentration risk percentage 18.00%
Geographic Concentration Risk | Single-family UPB | Southwest  
Concentration Risk [Line Items]  
Portfolio UPB $ 481,976
Concentration risk percentage 15.00%
Geographic Concentration Risk | Single-family UPB | North Central  
Concentration Risk [Line Items]  
Portfolio UPB $ 466,685
Concentration risk percentage 15.00%
Geographic Concentration Risk | Single-family UPB | California  
Concentration Risk [Line Items]  
Portfolio UPB $ 507,190
Concentration risk percentage 16.00%
Geographic Concentration Risk | Single-family UPB | Texas  
Concentration Risk [Line Items]  
Portfolio UPB $ 231,131
Concentration risk percentage 7.00%
Geographic Concentration Risk | Single-family UPB | Florida  
Concentration Risk [Line Items]  
Portfolio UPB $ 214,660
Concentration risk percentage 7.00%
Geographic Concentration Risk | Single-family UPB | New York  
Concentration Risk [Line Items]  
Portfolio UPB $ 139,558
Concentration risk percentage 4.00%
Geographic Concentration Risk | Single-family UPB | Illinois  
Concentration Risk [Line Items]  
Portfolio UPB $ 118,733
Concentration risk percentage 4.00%