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, 2017	$ 65,708	$ (8)	$ 65,171	$ (8)	$ 0	$ 0	$ 4,766	$ 0	$ (47,595)	$ 0	$ 81,078	$ 0	$ 21,457	$ 568	$ 5,465	$ (576)	$ 537	$ 0
Common stock issued under stock plans	(155)		(155)		0		0		189		(344)		0		0		0
Purchase of common stock	(1,739)		(1,739)		0		0		(1,739)		0		0		0		0
Net income (loss) attributable to AIG or noncontrolling interests	61		(6)		0		0		0		0		(6)		0		67
Dividends on common stock	(1,138)		(1,138)		0		0		0		0		(1,138)		0		0
Other comprehensive income (loss)	(6,293)		(6,302)		0		0		0		0		0		(6,302)		9
Net increase (decrease) due to divestitures and acquisitions	63		0		0		0		0		0		0		0		63
Contributions from noncontrolling interests	373		0		0		0		0		0		0		0		373
Distributions to noncontrolling interests	(96)		0		0		0		0		0		0		0		(96)
Other	533		538		0		0		1		534		3		0		(5)
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	(80)		(80)		0		0		156		(236)		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	4,169		3,348		0		0		0		0		3,348		0		821
Dividends on preferred stock	(22)		(22)		0		0		0		0		(22)		0		0
Dividends on common stock	(1,114)		(1,114)		0		0		0		0		(1,114)		0		0
Other comprehensive income (loss)	6,415		6,395		0		0		0		0		0		6,395		20
Net increase (decrease) due to divestitures and acquisitions	65		0		0		0		0		0		0		0		65
Contributions from noncontrolling interests	19		0		0		0		0		0		0		0		19
Distributions to noncontrolling interests	(131)		0		0		0		0		0		0		0		(131)
Other	312		302		0		0		1		313		(12)		0		10
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	(99)		(99)		0		0		172		(271)		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	(5,829)		(5,944)		0		0		0		0		(5,944)		0		115
Dividends on preferred stock	(29)		(29)		0		0		0		0		(29)		0		0
Dividends on common stock	(1,103)		(1,103)		0		0		0		0		(1,103)		0		0
Other comprehensive income (loss)	8,513		8,529		0		0		0		0		0		8,529		(16)
Net increase (decrease) due to divestitures and acquisitions	(958)		0		0		0		0		0		0		0		(958)
Contributions from noncontrolling interests	108		0		0		0		0		0		0		0		108
Distributions to noncontrolling interests	(156)		0		0		0		0		0		0		0		(156)
Other	312		320		0		0		(7)		344		(17)		0		(8)
Balance at Dec. 31, 2020	$ 67,199		$ 66,362		$ 485		$ 4,766		$ (49,322)		$ 81,418		$ 15,504		$ 13,511		$ 837