Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator for EPS:
Income (loss) from continuing operations	$ 698	$ 797
Less: Preferred stock dividends and preferred stock redemption premiums	0	22
Income (loss) attributable to AIG common shareholders from continuing operations	698	775
Income (loss) from discontinued operations, net of income tax expense	0	803
Less: Net income attributable to noncontrolling interests	0	384
Net loss from discontinued operations attributable to AIG	0	419
Net income (loss) attributable to AIG common shareholders	$ 698	$ 1,194
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	593,839,665	682,576,848
Dilutive common shares (in shares)	5,400,381	5,384,670
Weighted average common shares outstanding - diluted (in shares)	599,240,046	687,961,518
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 1.18	$ 1.14
Income (loss) from discontinued operations (in dollars per share)	0	0.61
Net income (loss) attributable to AIG common shareholders (in dollars per share)	1.18	1.75
Diluted:
Income (loss) from continuing operations (in dollars per share)	1.16	1.13
Income (loss) from discontinued operations (in dollars per share)	0	0.61
Net income (loss) attributable to AIG common shareholders (in dollars per share)	$ 1.16	$ 1.74
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	161,754	141,749