Income Taxes -Schedule of net deferred tax assets (liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Valuation Allowance [Line Items]
Valuation allowance	$ (3,116)	$ (4,250)
Net deferred tax assets (liabilities)	14,099	14,509
Net deferred tax assets before valuation allowance	17,215	18,759
Subtotal - Net U.S., foreign, state and local deferred tax assets	14,445	14,804
Net foreign, state and local deferred tax liabilities	(2,564)	(2,750)
Total AIG net deferred tax assets (liabilities)	14,099	14,509
Foreign State And Local
Valuation Allowance [Line Items]
Valuation allowance	(1,110)	(1,122)
Net deferred tax assets (liabilities)	848	1,220
Net deferred tax assets before valuation allowance	1,958	2,342
Net foreign, state and local deferred tax liabilities	(346)	(295)
Total AIG net deferred tax assets (liabilities)	848	1,220
Domestic Tax Authority
Valuation Allowance [Line Items]
Net U.S. deferred tax assets	11,317	10,831
Net deferred tax assets (liabilities) in AOCI	4,286	5,881
Valuation allowance	(2,006)	(3,128)
Net deferred tax assets (liabilities)	13,597	13,584
Total AIG net deferred tax assets (liabilities)	$ 13,597	$ 13,584