v3.25.1
FANNIE MAE COMMITMENTS AND PLEDGED SECURITIES - Commitments (Detail) - DUS Risk-Sharing Obligations
$ in Millions
3 Months Ended
Mar. 31, 2025
USD ($)
Fannie Mae, Freddie Mac, HUD and Ginnie Mae  
LITIGATION, COMMITMENTS, AND CONTINGENCIES  
Minimum liquid assets to be maintained to meet operational liquidity requirements $ 66.5
Operational liquidity $ 157.1
Fannie Mae  
LITIGATION, COMMITMENTS, AND CONTINGENCIES  
Period of funding for collateral requirement 48 months
Amount of additional capital required to be funded over the next 48 months $ 78.3
Net worth requirement 334.5
Net worth $ 977.5
Fannie Mae | New Tier 2 loans  
LITIGATION, COMMITMENTS, AND CONTINGENCIES  
Collateral requirements percentage 0.75%
Period of funding for collateral requirement 48 months
Fannie Mae | New Tier 2 loans | Money Market Funds  
LITIGATION, COMMITMENTS, AND CONTINGENCIES  
Restricted liquidity collateral reduction percentage 5.00%
Fannie Mae | New Tier 2 loans | Agency MBS  
LITIGATION, COMMITMENTS, AND CONTINGENCIES  
Restricted liquidity collateral reduction percentage 4.00%