Income Taxes -Schedule of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Valuation Allowance [Line Items]
Valuation allowance	$ (1,650)	$ (1,746)
Net deferred tax assets (liabilities)	4,530	5,839
Net deferred tax assets before valuation allowance	6,180	7,585
Subtotal - Net U.S., foreign, state and local deferred tax assets	4,956	6,186
Net foreign, state and local deferred tax liabilities	(323)	(365)
Total AIG net deferred tax assets (liabilities)	4,530	5,839
Foreign State And Local
Valuation Allowance [Line Items]
Valuation allowance	(852)	(906)
Net deferred tax assets (liabilities)	411	525
Net deferred tax assets before valuation allowance	1,263	1,431
Net foreign, state and local deferred tax liabilities	(426)	(347)
Total AIG net deferred tax assets (liabilities)	411	525
Domestic Tax Jurisdiction
Valuation Allowance [Line Items]
Net U.S. deferred tax assets	4,922	5,992
Net deferred tax assets (liabilities) in AOCI	421	509
Valuation allowance	(798)	(840)
Net deferred tax assets (liabilities)	4,545	5,661
Total AIG net deferred tax assets (liabilities)	$ 4,545	$ 5,661