Income Taxes - Schedule of Consolidated Income Tax Group Credits Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, gross	$ 15,610
Net operating loss carryforwards, tax effected	3,278
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	3,278
2028
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, tax effected	1,300
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	1,300
2029
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, tax effected	178
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	178
2030
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, tax effected	0
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	0
2031
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, tax effected	930
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	930
Unlimited Carryforward Period and Carryforward Periods
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, tax effected	870
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	$ 870