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Insurance Company Regulatory Requirements - Narrative (Details) € in Millions, £ in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€)
AGUK |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Own Funds |  |  |  | £ 592 | $ 716 |  | £ 591 | $ 800 |
AGE |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Own Funds |  |  |  |  | 56 | € 52 |  | $ 66 | € 58
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 |  | $ 209 |  |  |  |  |  |  |
Amount available for distribution, next fiscal quarter |  |  | $ 40 |  |  |  |  |  |
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 |  |  | $ 20 |  |  |  |  |  |
AGC | Maryland | AGC |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Amount available for distribution, current year |  |  |  |  | 102 |  |  |  |
AG Re | Bermuda |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Amount available for distribution, current year |  |  |  |  | 210 |  |  |  |
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 |  |  |  |  | 210 |  |  |  |
Unencumbered assets |  |  |  |  | 138 |  |  |  |
Statutory amount available for dividend payments, deficit |  |  |  |  | (19) |  |  |  |
AGRO | Bermuda |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |
Amount available for distribution, current year |  |  |  |  | 98 |  |  |  |
Capital distributions | $ 21 |  |  |  |  |  |  |  |
Statutory surplus |  |  |  |  | 98 |  |  |  |
Unencumbered assets |  |  |  |  | 374 |  |  |  |
Statutory amount available for dividend payments |  |  |  |  | $ (253) |  |  |  |

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