Condensed Consolidated Statements of Equity - USD ($) $ in Millions	Total	Cumulative effect of change in accounting principle	Total AIG Shareholders' Equity	Total AIG Shareholders' Equity Cumulative effect of change in accounting principle	Preferred Stock and Additional Paid-In Capital	Preferred Stock and Additional Paid-In Capital Cumulative effect of change in accounting principle	Common Stock	Common Stock Cumulative effect of change in accounting principle	Treasury Stock	Treasury Stock Cumulative effect of change in accounting principle	Additional Paid-in Capital	Additional Paid-in Capital Cumulative effect of change in accounting principle	Retained Earnings	Retained Earnings Cumulative effect of change in accounting principle	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative effect of change in accounting principle	Non redeemable Non-controlling Interests	Non redeemable Non-controlling Interests Cumulative effect of change in accounting principle
Balance at Dec. 31, 2018	$ 57,309		$ 56,361		$ 0		$ 4,766		$ (49,144)		$ 81,268		$ 20,884		$ (1,413)		$ 948
Preferred stock issued	485		485		485		0		0		0		0		0		0
Common stock issued under stock plans	(77)		(77)		0		0		154		(231)		0		0		0
Purchase of common stock	0		0		0		0		0		0		0		0		0
Net income (loss) attributable to AIG or noncontrolling interests	3,300		2,419		0		0		0		0		2,419		0		881
Dividends on preferred stock	(15)		(15)		0		0		0		0		(15)		0		0
Dividends on common stock	(835)		(835)		0		0		0		0		(835)		0		0
Other comprehensive income (loss)	7,048		7,028		0		0		0		0		0		7,028		20
Current and deferred income taxes	0		0		0		0		0		0		0		0		0
Net increase due to acquisitions and consolidations	78		0		0		0		0		0		0		0		78
Contributions from noncontrolling interests	13		0		0		0		0		0		0		0		13
Distributions to noncontrolling interests	(106)		0		0		0		0		0		0		0		(106)
Other	245		237		0		0		1		250		(14)		0		8
Balance at Sep. 30, 2019	67,445		65,603		485		4,766		(48,989)		81,287		22,439		5,615		1,842
Balance at Jun. 30, 2019	66,105		64,539		485		4,766		(48,991)		81,211		22,077		4,991		1,566
Preferred stock issued	0		0		0		0		0		0		0		0		0
Common stock issued under stock plans	1		1		0		0		1		0		0		0		0
Purchase of common stock	0		0		0		0		0		0		0		0		0
Net income (loss) attributable to AIG or noncontrolling interests	973		656		0		0		0		0		656		0		317
Dividends on preferred stock	(8)		(8)		0		0		0		0		(8)		0		0
Dividends on common stock	(278)		(278)		0		0		0		0		(278)		0		0
Other comprehensive income (loss)	628		624		0		0		0		0		0		624		4
Current and deferred income taxes	0		0		0		0		0		0		0		0		0
Net increase due to acquisitions and consolidations	(18)		0		0		0		0		0		0		0		(18)
Contributions from noncontrolling interests	11		0		0		0		0		0		0		0		11
Distributions to noncontrolling interests	(37)		0		0		0		0		0		0		0		(37)
Other	68		69		0		0		1		76		(8)		0		(1)
Balance at Sep. 30, 2019	67,445		65,603		485		4,766		(48,989)		81,287		22,439		5,615		1,842
Balance at Dec. 31, 2019	67,427	$ (487)	65,675	$ (487)	485	$ 0	4,766	$ 0	(48,987)	$ 0	81,345	$ 0	23,084	$ (487)	4,982	$ 0	1,752	$ 0
Preferred stock issued	0		0		0		0		0		0		0		0		0
Common stock issued under stock plans	(98)		(98)		0		0		167		(265)		0		0		0
Purchase of common stock	(500)		(500)		0		0		(500)		0		0		0		0
Net income (loss) attributable to AIG or noncontrolling interests	(5,813)		(5,891)		0		0		0		0		(5,891)		0		78
Dividends on preferred stock	(22)		(22)		0		0		0		0		(22)		0		0
Dividends on common stock	(827)		(827)		0		0		0		0		(827)		0		0
Other comprehensive income (loss)	5,980		5,996		0		0		0		0		0		5,996		(16)
Net decrease due to deconsolidation	(1,199)		0		0		0		0		0		0		0		(1,199)
Contributions from noncontrolling interests	4		0		0		0		0		0		0		0		4
Distributions to noncontrolling interests	(113)		0		0		0		0		0		0		0		(113)
Other	255		262		0		0		(7)		288		(19)		0		(7)
Balance at Sep. 30, 2020	64,607		64,108		485		4,766		(49,327)		81,368		15,838		10,978		499
Balance at Jun. 30, 2020	62,818	$ 0	62,234	$ 0	485	$ 0	4,766	$ 0	(49,327)	$ 0	81,294	$ 0	15,847	$ 0	9,169	$ 0	584	$ 0
Preferred stock issued	0		0		0		0		0		0		0		0		0
Common stock issued under stock plans	(1)		(1)		0		0		0		(1)		0		0		0
Purchase of common stock	0		0		0		0		0		0		0		0		0
Net income (loss) attributable to AIG or noncontrolling interests	299		288		0		0		0		0		288		0		11
Dividends on preferred stock	(7)		(7)		0		0		0		0		(7)		0		0
Dividends on common stock	(276)		(276)		0		0		0		0		(276)		0		0
Other comprehensive income (loss)	1,816		1,809		0		0		0		0		0		1,809		7
Net decrease due to deconsolidation	(28)		0		0		0		0		0		0		0		(28)
Contributions from noncontrolling interests	0		0		0		0		0		0		0		0		0
Distributions to noncontrolling interests	(71)		0		0		0		0		0		0		0		(71)
Other	57		61		0		0		0		75		(14)		0		(4)
Balance at Sep. 30, 2020	$ 64,607		$ 64,108		$ 485		$ 4,766		$ (49,327)		$ 81,368		$ 15,838		$ 10,978		$ 499