Income Taxes -Schedule of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Valuation Allowance [Line Items]
Valuation allowance	$ (1,051)	$ (1,650)
Net deferred tax assets	4,482	4,530
Net deferred tax assets before valuation allowance	5,533	6,180
Subtotal - Net U.S., foreign, state and local deferred tax assets	5,096	4,956
Net foreign, state and local deferred tax liabilities	(343)	(323)
Total AIG net deferred tax assets (liabilities)	4,482	4,530
Foreign State And Local
Valuation Allowance [Line Items]
Valuation allowance	(857)	(852)
Net deferred tax assets	346	411
Net deferred tax assets before valuation allowance	1,203	1,263
Net foreign, state and local deferred tax liabilities	(614)	(426)
Total AIG net deferred tax assets (liabilities)	346	411
Domestic Tax Jurisdiction
Valuation Allowance [Line Items]
Net U.S. deferred tax assets	4,835	4,922
Net deferred tax assets (liabilities) in AOCI	109	421
Valuation allowance	(194)	(798)
Net deferred tax assets	4,750	4,545
Total AIG net deferred tax assets (liabilities)	$ 4,750	$ 4,545