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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Loss reserves and tax discount | $ 550 | $ 517
Unearned premium reserve and other underwriting related reserves | 517 | 483
Employee benefits | 181 | 172
Deferred Tax Assets, Other Comprehensive Loss | 394 | 387
Net operating loss carryover | 41 | 45
Other | 0 | 1
Total Deferred Tax Assets | 1,683 | 1,605
Deferred Tax Assets, Valuation Allowance | 0 | (12)
Deferred Tax Assets, Net of Valuation Allowance | 1,683 | 1,593
Deferred acquisition costs | (183) | (163)
Net unrealized gains on investments | (167) | (110)
Other depreciable and amortizable assets | (91) | (147)
Total Deferred Tax Liabilities | (454) | (420)
Net Deferred Tax Asset | 1,229 | 1,173
Deferred Tax Liabilities, Other | $ 13 | $ 0

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