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, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	25.73%	28.72%	37.98%
Risk-free interest rate	4.28%	4.36%	4.42%
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