Share-Based Compensation Plans - Schedule of assumptions used to estimate the fair value of PSUs based on AIG's TSR (Details) - Performance Shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	37.98%	47.60%	47.63%
Risk-free interest rate	4.42%	1.71%	0.28%
Historic volatility term	2 years 10 months 9 days
Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Continuously compounded rates term	2 years
Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Continuously compounded rates term	3 years