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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
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