Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator for EPS:
Income from continuing operations	$ 1,144	$ 475	$ 1,842	$ 1,272
Less: Preferred stock dividends and preferred stock redemption premiums	0	0	0	22
Income attributable to AIG common shareholders from continuing operations	1,144	475	1,842	1,250
Loss from discontinued operations, net of income tax expense	0	(4,359)	0	(3,556)
Less: Net income attributable to noncontrolling interests	0	93	0	477
Net loss from discontinued operations attributable to AIG	0	(4,452)	0	(4,033)
Net income (loss) attributable to AIG common shareholders	$ 1,144	$ (3,977)	$ 1,842	$ (2,783)
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	572,817,409	661,092,967	583,272,826	671,834,907
Dilutive common shares (in shares)	5,123,823	5,862,201	5,262,102	5,623,436
Weighted average common shares outstanding - diluted (in shares)	577,941,232	666,955,168	588,534,928	677,458,343
Basic:
Income from continuing operations (in dollars per share)	$ 2.00	$ 0.72	$ 3.16	$ 1.86
Loss from discontinued operations (in dollars per share)	0	(6.74)	0	(6.00)
Net income (loss) attributable to AIG common shareholders (in dollars per share)	2.00	(6.02)	3.16	(4.14)
Diluted:
Income from continuing operations (in dollars per share)	1.98	0.71	3.13	1.85
Loss from discontinued operations (in dollars per share)	0	(6.67)	0	(5.96)
Net income (loss) attributable to AIG common shareholders (in dollars per share)	$ 1.98	$ (5.96)	$ 3.13	$ (4.11)
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	118,717	89,983	140,236	115,866