Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator for EPS:
Net income	$ 763	$ 698
Less: Net income attributable to noncontrolling interests	0	0
Net income attributable to AIG common shareholders	$ 763	$ 698
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	538,053,962	593,839,665
Dilutive common shares (in shares)	4,106,994	5,400,381
Weighted average common shares outstanding - diluted (in shares)	542,160,956	599,240,046
Net income (loss) per common share attributable to AIG common shareholders:
Basic (in dollars per share)	$ 1.42	$ 1.18
Diluted (in dollars per share)	$ 1.41	$ 1.16
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	653,677	161,754