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Insurance Company Regulatory Requirements - Dividends and Surplus Notes By Insurance Company Subsidiaries (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | $ 67 | $ 64 | $ 66
Redemption of common stock by AGC from AGUS | 199 | 500 | 496
AGC | AGC | Related Party |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | 102 | 207 | 94
Redemption of common stock by AGC from AGUS | 200 | 0 | 0
Assured Guaranty Municipal Corp | AGMH | Related Party |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | 257 | 266 | 291
AG Re | Assured Guaranty LTD |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividend from a subsidiary in the form of fixed-maturity securities | 0 | 0 | 46
AG Re | Assured Guaranty LTD | Related Party |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | 53 | 0 | 150
AGUK | Assured Guaranty Municipal Corp | Related Party |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | $ 127 | $ 0 | $ 0

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