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Insurance Company Regulatory Requirements - Narrative (Details) € in Millions, £ in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 EUR (€)
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Dividends paid | $ 67 | $ 64 | $ 66 |  |  |  |  |  |
AGUK |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Own funds | 672 | 716 |  |  |  | £ 528 |  | £ 592 |
AGE |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Own funds | $ 49 | $ 56 |  |  |  |  | € 44 |  | € 52
Assured Guaranty Municipal Corp And Municipal Assurance Corp | New York |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Threshold for dividend payments as a percentage of policyholder surplus | 10.00% |  |  |  |  |  |  |  |
Threshold for dividend payments, percentage of adjusted net investment income | 100.00% |  |  |  |  |  |  |  |
Assured Guaranty Municipal Corp | New York | Forecast |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Amount available for distribution, current year |  |  |  | $ 265 |  |  |  |  |
Amount available for distribution, next fiscal quarter |  |  |  |  | $ 47 |  |  |  |
AGC | Maryland |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Threshold for dividend payments as a percentage of policyholder surplus | 10.00% |  |  |  |  |  |  |  |
Threshold for dividend payments, percentage of adjusted net investment income | 100.00% |  |  |  |  |  |  |  |
AGC | Maryland | Forecast |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Amount available for distribution, next fiscal quarter |  |  |  |  | $ 35 |  |  |  |
AGC | Maryland | AGC |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Amount available for distribution, current year | $ 117 |  |  |  |  |  |  |  |
AG Re | Bermuda |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Amount available for distribution, current year | $ 226 |  |  |  |  |  |  |  |
Dividend payment restrictions, percentage of statutory capital | 15.00% |  |  |  |  |  |  |  |
Dividend restrictions on statutory capital and surplus (as a percent) | 25.00% |  |  |  |  |  |  |  |
Capital distributions | $ 129 |  |  |  |  |  |  |  |
Statutory surplus | 226 |  |  |  |  |  |  |  |
Unencumbered assets | 138 |  |  |  |  |  |  |  |
Statutory amount available for dividend payments, deficit | 47 |  |  |  |  |  |  |  |
AGRO | Bermuda |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Amount available for distribution, current year | 103 |  |  |  |  |  |  |  |
Capital distributions | 21 |  |  |  |  |  |  |  |
Statutory surplus | 103 |  |  |  |  |  |  |  |
Unencumbered assets | 383 |  |  |  |  |  |  |  |
Statutory amount available for dividend payments | $ (275) |  |  |  |  |  |  |  |

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