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Insurance Company Regulatory Requirements - Insurance Regulatory Amounts Reported (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Assured Guaranty Municipal Corp |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | $ 2,646 | $ 2,747 |
Net Income (Loss) | 209 | 163 | $ 352
Statutory capital and surplus required | 876 | 855 |
AGC |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | 1,651 | 1,916 |
Net Income (Loss) | 79 | 62 | 282
Statutory capital and surplus required | 420 | 347 |
AG Re |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | 905 | 839 |
Net Income (Loss) | 95 | 53 | 121
AGRO |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | 412 | 390 |
Net Income (Loss) | $ 16 | $ 9 | $ 6

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