Income Taxes - Schedule of Components of the Net Deferred Tax Asset (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Losses and tax credit carryforwards	$ 4,155	$ 4,636
Basis differences on investments	336	30
Accruals not currently deductible, and other	276	150
Investments in foreign subsidiaries	29	19
Loss reserve discount	440	443
Loan loss and other reserves	43	37
Unearned premium reserve reduction	0	46
Fixed assets and intangible assets	271	293
Unrealized losses related to available for sale debt securities	153	618
Employee benefits	163	192
Other	10	39
Total deferred tax assets	5,876	6,503
Deferred tax liabilities:
Deferred policy acquisition costs	(139)	(278)
Life policy reserves	(43)	(45)
Unearned premium reserve reduction	(161)	0
Deferred tax liabilities	(343)	(323)
Net deferred tax assets before valuation allowance	5,533	6,180
Valuation allowance	(1,051)	(1,650)
Net deferred tax assets	$ 4,482	$ 4,530