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Insurance Company Regulatory Requirements - Insurance Regulatory Amounts Reported (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AG (U.S. domiciled) |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | $ 3,524 | $ 3,997 |
Net Income (Loss) | 355 | 289 | $ 225
Statutory capital and surplus required | 1,392 | 1,296 |
AG Re |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | 1,087 | 905 |
Net Income (Loss) | 98 | 95 | 53
AGRO |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Policyholders’ Surplus | 452 | 412 |
Net Income (Loss) | $ 22 | $ 16 | $ 9

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