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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Loss reserves and tax discount $ 449 $ 386  
Unearned premium reserve and other underwriting related reserves 442 406  
Investment-related items 0 8  
Employee benefits 167 225  
Deferred Tax Assets, Other Comprehensive Loss 668 0  
Net operating loss carryover 37 29  
Other 19 0  
Total Deferred Tax Assets 1,782 1,054  
Deferred Tax Assets, Valuation Allowance (27) (7)  
Deferred Tax Assets, Net of Valuation Allowance 1,755 1,047  
Deferred acquisition costs (146) (129)  
Net unrealized gains on investments (48) 0  
Deferred Tax Liabilities, Other Comprehensive Income 0 428  
Other depreciable and amortizable assets (112) (216)  
Deferred Tax Liabilities, Other 0 4  
Total Deferred Tax Liabilities (306) (777)  
Net Deferred Tax Asset $ 1,449 $ 270 $ 299