Equity - Schedule of Effect of the Reclassification of Significant Items out of Accumulated Other Comprehensive Income on the Respective Line Items in the Consolidated Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reclassification of significant items out of Accumulated Other Comprehensive Income
Total net realized losses	$ (1,202)	$ (548)	$ (1,078)
Net income (loss) attributable to AIG	3,096	(1,404)	3,643
Amount Reclassified from AOCI
Reclassification of significant items out of Accumulated Other Comprehensive Income
Net income (loss) attributable to AIG	(623)	(7,864)	(1,091)
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken | Amount Reclassified from AOCI
Reclassification of significant items out of Accumulated Other Comprehensive Income
Total net realized losses	0	0	(26)
Net income (loss) attributable to AIG	0	0	(26)
Unrealized Appreciation (Depreciation) of All Other Investments | Amount Reclassified from AOCI
Reclassification of significant items out of Accumulated Other Comprehensive Income
Total net realized losses	(593)	(619)	(1,036)
Net income (loss) attributable to AIG	(593)	(619)	(1,036)
Retirement Plan Liabilities Adjustment | Amount Reclassified from AOCI
Reclassification of significant items out of Accumulated Other Comprehensive Income
Net income (loss) attributable to AIG	(30)	(31)	(29)
Prior-service credit | Amount Reclassified from AOCI
Reclassification of significant items out of Accumulated Other Comprehensive Income
Net income (loss) attributable to AIG	(2)	(2)	(2)
Actuarial losses | Amount Reclassified from AOCI
Reclassification of significant items out of Accumulated Other Comprehensive Income
Net income (loss) attributable to AIG	(28)	(29)	(27)
Corebridge deconsolidation, net of tax | Amount Reclassified from AOCI
Reclassification of significant items out of Accumulated Other Comprehensive Income
Net income (loss) attributable to AIG	$ 0	$ (7,214)	$ 0