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Insurance Company Regulatory Requirements - Insurance Regulatory Amounts Reported (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Assured Guaranty Municipal Corp |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | $ 2,747 | $ 3,053 |
Net Income (Loss) | 163 | 352 | $ 398
Statutory capital and surplus required | 855 | 877 |
AGC |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | 1,916 | 2,070 |
Net Income (Loss) | 62 | 282 | 73
Statutory capital and surplus required | 347 | 348 |
AG Re |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | 839 | 944 |
Net Income (Loss) | 53 | 121 | 24
AGRO |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | 390 | 425 |
Net Income (Loss) | $ 9 | $ 6 | $ 7

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