v3.25.2
Concentration of Credit and Other Risks - Concentration of Credit Risk - Single-Family Mortgage Portfolio (Details)
$ in Millions
Jun. 30, 2025
USD ($)
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.55%
West  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.44%
Northeast  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.58%
Southeast  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.65%
Southwest  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.58%
North Central  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.54%
California  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.45%
Texas  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.64%
Florida  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.81%
New York  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.80%
Illinois  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.67%
All Other  
Concentration Risk [Line Items]  
Single-Family serious delinquency rate 0.51%
Geographic Concentration Risk | All Other  
Concentration Risk [Line Items]  
Portfolio UPB $ 1,922,277
Concentration risk percentage 61.00%
Geographic Concentration Risk | Single-family UPB  
Concentration Risk [Line Items]  
Portfolio UPB $ 3,126,425
Concentration risk percentage 100.00%
Geographic Concentration Risk | Single-family UPB | West  
Concentration Risk [Line Items]  
Portfolio UPB $ 921,200
Concentration risk percentage 29.00%
Geographic Concentration Risk | Single-family UPB | Northeast  
Concentration Risk [Line Items]  
Portfolio UPB $ 721,250
Concentration risk percentage 23.00%
Geographic Concentration Risk | Single-family UPB | Southeast  
Concentration Risk [Line Items]  
Portfolio UPB $ 556,024
Concentration risk percentage 18.00%
Geographic Concentration Risk | Single-family UPB | Southwest  
Concentration Risk [Line Items]  
Portfolio UPB $ 471,898
Concentration risk percentage 15.00%
Geographic Concentration Risk | Single-family UPB | North Central  
Concentration Risk [Line Items]  
Portfolio UPB $ 456,053
Concentration risk percentage 15.00%
Geographic Concentration Risk | Single-family UPB | California  
Concentration Risk [Line Items]  
Portfolio UPB $ 513,422
Concentration risk percentage 17.00%
Geographic Concentration Risk | Single-family UPB | Texas  
Concentration Risk [Line Items]  
Portfolio UPB $ 226,399
Concentration risk percentage 7.00%
Geographic Concentration Risk | Single-family UPB | Florida  
Concentration Risk [Line Items]  
Portfolio UPB $ 211,145
Concentration risk percentage 7.00%
Geographic Concentration Risk | Single-family UPB | New York  
Concentration Risk [Line Items]  
Portfolio UPB $ 136,540
Concentration risk percentage 4.00%
Geographic Concentration Risk | Single-family UPB | Illinois  
Concentration Risk [Line Items]  
Portfolio UPB $ 116,642
Concentration risk percentage 4.00%