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Income Taxes (Components Of Deferred Tax Assets and Liabilities) (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax liabilities:    
Unearned premium revenue $ 30 $ 34
Deferred acquisition costs 6 7
Net gains on financial instruments at fair value and foreign exchange 32 102
Net deferred taxes on VIEs 2 11
Total gross deferred tax liabilities 70 154
Deferred tax assets:    
Compensation and employee benefits 4 7
Accrued interest 326 292
Loss and loss adjustment expense reserves 40 62
Net operating loss 918 871
Foreign tax credits 55 56
Other-than-temporary impairments and capital loss carryforward 51 55
Net unrealized gains and losses in accumulated other comprehensive income 27 30
Other 29 26
Total gross deferred tax assets 1,450 1,399
Valuation allowance 1,380 1,245
Net deferred tax asset $ 0 $ 0