Income Taxes - Schedule of consolidated income tax group credits carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, gross	$ 21,968
Net operating loss carryforwards	4,613
Other carryforwards	67
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis(a)	4,680
2024
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis(a)	0
2025
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis(a)	0
2026
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis(a)	0
2027
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis(a)	0
2028
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,660
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis(a)	2,660
2029
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	178
Other carryforwards	0
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis(a)	178
Unlimited Carryforwards And Tax Years 2029 And After
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,775
Other carryforwards	67
Total AIG U.S. consolidated federal income tax group tax losses and credits carryforwards on a U.S. GAAP basis(a)	$ 1,842