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Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Unearned premiums $ 193 $ 165
Loss and loss expense reserves 141 120
Net operating loss on international earnings 19 26
Foreign tax credits 23 0
Other 80 70
Total gross deferred tax assets 456 381
Deferred tax liabilities:    
Investment gains and other, net 1,434 1,290
Deferred acquisition costs 212 184
Life policy reserves 96 104
Deferred international earnings 56 21
Investments 55 35
Other 79 71
Total gross deferred tax liabilities 1,932 1,705
Deferred Tax Liabilities, Net $ 1,476 $ 1,324