Income Taxes - Schedule of components of the net deferred tax asset (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Losses and tax credit carryforwards	$ 6,107	$ 6,868
Basis differences on investments	3,441	2,652
Life policy reserves	1,589	1,622
Accruals not currently deductible, and other	89	392
Investments in foreign subsidiaries	66
Loss reserve discount	424	352
Loan loss and other reserves	51	62
Unearned premium reserve reduction	87	294
Fixed assets and intangible assets	1,487	1,081
Unrealized losses related to available for sale debt securities	4,728	6,519
Employee benefits	344	382
Market risk benefit	1,010	827
Other	356	458
Total deferred tax assets	19,779	21,509
Deferred tax liabilities:
Investments in foreign subsidiaries	0	(41)
Deferred policy acquisition costs	(1,853)	(1,847)
Fortitude Re funds withheld embedded derivative	(711)	(862)
Deferred tax liabilities	(2,564)	(2,750)
Net deferred tax assets before valuation allowance	17,215	18,759
Valuation allowance	(3,116)	(4,250)
Net deferred tax assets (liabilities)	$ 14,099	$ 14,509