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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | $ 68 | $ 67 | $ 64
Stock redemptions by insurance subsidiaries | 502 | 199 | 500
Related Party |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Stock redemptions by insurance subsidiaries | 400 | 200 | 0
AG Re | Assured Guaranty LTD | Related Party |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | 97 | 53 | 0
AGUK | AG (U.S. domiciled) | Related Party |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | 128 | 127 | 0
US Insurance Subsidiaries | US Holding Companies | Related Party |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Dividends paid | $ 400 | $ 358 | $ 473

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