Income Taxes - Schedule of Consolidated Income Tax Group Credits Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, gross	$ 18,046
Net operating loss carryforwards, tax effected	3,790
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	3,790
2028
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, tax effected	1,836
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	1,836
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	846
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis	$ 846