Financial Guarantees (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Financial Guarantees and Maximum Recovery [Line Items] | ||
| Contractual terms of our guarantees | 30 years | |
| Maximum Exposure | $ 11,380 | $ 11,398 |
| Guarantor obligation | 96 | 69 |
| Maximum recovery | 4,319 | 4,386 |
| Unconsolidated VIEs | Unconsolidated Fannie Mae MBS | ||
| Financial Guarantees and Maximum Recovery [Line Items] | ||
| Maximum Exposure | 2,229 | 2,484 |
| Guarantor obligation | 13 | 13 |
| Maximum recovery | 2,187 | 2,432 |
| Unconsolidated VIEs | Other guaranty arrangements | ||
| Financial Guarantees and Maximum Recovery [Line Items] | ||
| Maximum Exposure | 9,151 | 8,914 |
| Guarantor obligation | 83 | 56 |
| Maximum recovery | 2,132 | 1,954 |
| Agency | Unconsolidated VIEs | ||
| Financial Guarantees and Maximum Recovery [Line Items] | ||
| Freddie Mac collateral included in Fannie Mae commingled security | $ 184,300 | $ 200,100 |