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	Accumulated Other Comprehensive Income 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, 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
Common stock issued under stock plans	(95)		(95)		0		0		160		(255)		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	1,654		1,749		0		0		0		0		1,749		0		(95)
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)	(5,990)		(5,976)		0		0		0		0		0		(5,976)		(14)
Net increase due to divestitures and acquisitions	48		0		0		0		0		0		0		0		48
Contributions from noncontrolling interests	1		0		0		0		0		0		0		0		1
Distributions to noncontrolling interests	(22)		0		0		0		0		0		0		0		(22)
Other	90		90		0		0		(7)		98		(1)		0		0
Balance at Mar. 31, 2020	61,843		60,173		485		4,766		(49,334)		81,188		24,062		(994)		1,670
Balance at Dec. 31, 2020	67,199	$ 0	66,362	$ 0	485	$ 0	4,766	$ 0	(49,322)	$ 0	81,418	$ 0	15,504	$ 0	13,511	$ 0	837	$ 0
Common stock issued under stock plans	(84)		(84)		0		0		171		(255)		0		0		0
Purchase of common stock	(362)		(362)		0		0		(362)		0		0		0		0
Net income (loss) attributable to AIG or noncontrolling interests	3,930		3,876		0		0		0		0		3,876		0		54
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)	(7,045)		(7,045)		0		0		0		0		0		(7,045)		0
Net increase due to divestitures and acquisitions	75		0		0		0		0		0		0		0		75
Contributions from noncontrolling interests	5		0		0		0		0		0		0		0		5
Distributions to noncontrolling interests	(90)		0		0		0		0		0		0		0		(90)
Other	215		215		0		0		101		90		24		0		0
Balance at Mar. 31, 2021	$ 63,560		$ 62,679		$ 485		$ 4,766		$ (49,412)		$ 81,253		$ 19,121		$ 6,466		$ 881