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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]    
Loss reserves and tax discount $ 517 $ 437
Unearned premium reserve and other underwriting related reserves 483 442
Employee benefits 172 167
Deferred Tax Assets, Other Comprehensive Loss 387 668
Net operating loss carryover 45 37
Other 1 19
Total Deferred Tax Assets 1,605 1,770
Deferred Tax Assets, Valuation Allowance (12) (27)
Deferred Tax Assets, Net of Valuation Allowance 1,593 1,743
Deferred acquisition costs (163) (146)
Net unrealized gains on investments (110) (48)
Other depreciable and amortizable assets (147) (112)
Total Deferred Tax Liabilities (420) (306)
Net Deferred Tax Asset $ 1,173 $ 1,437