Segment Reporting - Schedule of Assets by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 4,335,856	$ 4,349,731
Business segments | Single-Family
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,788,572	3,823,840
Business segments | Multifamily
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 547,284	$ 525,891