Outstanding Exposure - Schedule of Non-Financial Guaranty Exposure (Details) - USD ($) $ in Billions |
Dec. 31, 2027 |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|---|
| Diversified real estate | |||
| Schedule of Insured Financial Obligations [Line Items] | |||
| Gross Exposure | $ 2.0 | $ 2.0 | |
| Net Exposure | 2.0 | 2.0 | |
| Insurance reserve financing and securitizations | |||
| Schedule of Insured Financial Obligations [Line Items] | |||
| Gross Exposure | 1.5 | 1.5 | |
| Net Exposure | 1.2 | 1.2 | |
| Insurance reserve financing and securitizations | Forecast | |||
| Schedule of Insured Financial Obligations [Line Items] | |||
| Gross Exposure | $ 1.6 | ||
| Net Exposure | $ 1.3 | ||
| Pooled corporate obligations | |||
| Schedule of Insured Financial Obligations [Line Items] | |||
| Gross Exposure | 0.7 | 0.9 | |
| Net Exposure | 0.7 | 0.9 | |
| Aircraft residual value insurance (RVI) | |||
| Schedule of Insured Financial Obligations [Line Items] | |||
| Gross Exposure | 0.2 | 0.2 | |
| Net Exposure | $ 0.1 | $ 0.1 |