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Insurance Contracts - Additional Information (Details) € in Millions, £ in Millions, $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 GBP (£) | Mar. 31, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 GBP (£) | Mar. 31, 2023 EUR (€) | Dec. 31, 2022 USD ($)
Insurance [Line Items] |  |  |  |  |  |  |  |
Reinsurance Recoverable Credit Exposure | $ 156 |  |  |  | $ 128 |  |  |
Estimated Future Premium Payments Weighted Average Discounted Rate | 3.20% |  | 3.20% | 3.20% | 3.20% |  |  |
Reinsurance Payable | $ 110 |  |  |  | $ 90 |  |  |
Weighted average period of future premiums | 7 years 8 months 12 days | 8 years |  |  |  |  |  |
Uncollectable premium receivables | $ 3 |  |  |  | 4 |  |  |
Reinsurance recoveries of losses included in losses and loss expenses | (35) | $ (20) |  |  |  |  |  |
Amortization of Intangible Assets | 12 | 7 |  |  |  |  |  |
Intangible assets, less accumulated amortization | 293 |  |  |  | 307 |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,418 | 1,307 |  |  | $ 1,415 |  |  | $ 1,305
Past Due Premiums | $ 503 | $ 0 |  |  |  |  |  |
Loss Reserves [Member] |  |  |  |  |  |  |  |
Insurance [Line Items] |  |  |  |  |  |  |  |
Weighted average risk-free rate used to discount loss reserves | 4.20% | 4.60% |  |  |  |  |  |
United Kingdom, Pounds |  |  |  |  |  |  |  |
Insurance [Line Items] |  |  |  |  |  |  |  |
Financial Guarantee Insurance Contracts, Premium Receivable | $ 71 | $ 75 | £ 56 |  |  | £ 61 |  |
Euro Member Countries, Euro |  |  |  |  |  |  |  |
Insurance [Line Items] |  |  |  |  |  |  |  |
Financial Guarantee Insurance Contracts, Premium Receivable | $ 13 | $ 15 |  | € 12 |  |  | € 13 |

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