Income Taxes - Schedule of Components of the Net Deferred Tax Asset (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Losses and tax credit carryforwards	$ 4,636	$ 5,655
Basis differences on investments	30	75
Accruals not currently deductible, and other	150	273
Investments in foreign subsidiaries	19	16
Loss reserve discount	443	424
Loan loss and other reserves	37	51
Unearned premium reserve reduction	46	87
Fixed assets and intangible assets	293	159
Unrealized losses related to available for sale debt securities	618	783
Employee benefits	192	271
Other	39	156
Total deferred tax assets	6,503	7,950
Deferred tax liabilities:
Deferred policy acquisition costs	(278)	(316)
Life policy reserves	(45)	(49)
Deferred tax liabilities	(323)	(365)
Net deferred tax assets before valuation allowance	6,180	7,585
Valuation allowance	(1,650)	(1,746)
Net deferred tax assets (liabilities)	$ 4,530	$ 5,839