Condensed Consolidated Statements of Equity - USD ($) $ in Millions	Total	Total AIG Share- holders' Equity	Preferred Stock and Additional Paid-in Capital	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- redeemable Non- controlling Interests
Balance, beginning of period at Dec. 31, 2023	$ 51,301	$ 45,351	$ 485	$ 4,766	$ (59,189)	$ 75,810	$ 37,516	$ (14,037)	$ 5,950
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans	8	8			322	(314)
Redemption of preferred stock	(485)	(485)	(485)
Purchase of common stock	(4,877)	(4,877)			(4,877)
Net income (loss) attributable to AIG or noncontrolling interests	(1,827)	(2,302)					(2,302)		475
Dividends on preferred stock and preferred stock redemption premiums	(22)	(22)					(22)
Dividends on common stock	(758)	(758)					(758)
Other comprehensive income	7,484	7,778						7,778	(294)
Net increase (decrease) due to divestitures and acquisitions	(5,891)	119				(418)		537	(6,010)
Contributions from noncontrolling interests	28								28
Distributions to noncontrolling interests	(72)								(72)
Other	184	227				232	(5)		(43)
Balance, end of period at Sep. 30, 2024	45,073	45,039		4,766	(63,744)	75,310	34,429	(5,722)	34
Balance, beginning of period at Jun. 30, 2024	44,475	44,445		4,766	(62,255)	75,274	34,225	(7,565)	30
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans	25	25			29	(4)
Purchase of common stock	(1,518)	(1,518)			(1,518)
Net income (loss) attributable to AIG or noncontrolling interests	457	459					459		(2)
Dividends on common stock	(254)	(254)					(254)
Other comprehensive income	1,847	1,843						1,843	4
Net increase (decrease) due to divestitures and acquisitions	(6)								(6)
Other	47	39				40	(1)		8
Balance, end of period at Sep. 30, 2024	45,073	45,039		4,766	(63,744)	75,310	34,429	(5,722)	34
Balance, beginning of period at Dec. 31, 2024	42,550	42,521	0	4,766	(65,573)	75,348	35,079	(7,099)	29
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans	34	34			208	(174)
Purchase of common stock	(5,302)	(5,302)			(5,302)
Net income (loss) attributable to AIG or noncontrolling interests	2,366	2,361					2,361		5
Dividends on common stock	(734)	(734)					(734)
Other comprehensive income	2,054	2,053						2,053	1
Distributions to noncontrolling interests	(5)								(5)
Other	154	152				160	(8)		2
Balance, end of period at Sep. 30, 2025	41,117	41,085	0	4,766	(70,667)	75,334	36,698	(5,046)	32
Balance, beginning of period at Jun. 30, 2025	41,529	41,501		4,766	(69,430)	75,289	36,424	(5,548)	28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under stock plans	8	8			9	(1)
Purchase of common stock	(1,246)	(1,246)			(1,246)
Net income (loss) attributable to AIG or noncontrolling interests	524	519					519		5
Dividends on common stock	(246)	(246)					(246)
Other comprehensive income	502	502						502
Other	46	47				46	1		(1)
Balance, end of period at Sep. 30, 2025	$ 41,117	$ 41,085	$ 0	$ 4,766	$ (70,667)	$ 75,334	$ 36,698	$ (5,046)	$ 32