Outstanding Exposure - Schedule of Non-Financial Guaranty Exposure (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Diversified real estate | ||
| Schedule of Insured Financial Obligations [Line Items] | ||
| Gross Exposure | $ 2,119 | $ 2,004 |
| Net Exposure | 2,119 | 2,004 |
| Insurance reserve financings and securitizations | ||
| Schedule of Insured Financial Obligations [Line Items] | ||
| Gross Exposure | 1,513 | 1,449 |
| Net Exposure | 1,184 | 1,126 |
| Pooled corporate obligations | ||
| Schedule of Insured Financial Obligations [Line Items] | ||
| Gross Exposure | 884 | 868 |
| Net Exposure | 884 | 868 |
| Aircraft residual value insurance | ||
| Schedule of Insured Financial Obligations [Line Items] | ||
| Gross Exposure | 147 | 147 |
| Net Exposure | $ 87 | $ 87 |