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, 2019	$ 67,427		$ 65,675		$ 485		$ 4,766		$ (48,987)		$ 81,345		$ 23,084		$ 4,982		$ 1,752
Common stock issued under stock plans	(97)		(97)		0		0		167		(264)		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	(6,112)		(6,179)		0		0		0		0		(6,179)		0		67
Dividends on preferred stock	(15)		(15)		0		0		0		0		(15)		0		0
Dividends on common stock	(551)		(551)		0		0		0		0		(551)		0		0
Other comprehensive income (loss)	4,164		4,187		0		0		0		0		0		4,187		(23)
Net increase (decrease) due to divestitures and acquisitions	(1,171)		0		0		0		0		0		0		0		(1,171)
Contributions from noncontrolling interests	4		0		0		0		0		0		0		0		4
Distributions to noncontrolling interests	(42)		0		0		0		0		0		0		0		(42)
Other	198		201		0		0		(7)		213		(5)		0		(3)
Balance at Jun. 30, 2020	62,818		62,234		485		4,766		(49,327)		81,294		15,847		9,169		584
Balance at Mar. 31, 2020	61,843	$ (487)	60,173	$ (487)	485	$ 0	4,766	$ 0	(49,334)	$ 0	81,188	$ 0	24,062	$ (487)	(994)	$ 0	1,670	$ 0
Common stock issued under stock plans	(2)		(2)		0		0		7		(9)		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	(7,766)		(7,928)		0		0		0		0		(7,928)		0		162
Dividends on preferred stock	(8)		(8)		0		0		0		0		(8)		0		0
Dividends on common stock	(275)		(275)		0		0		0		0		(275)		0		0
Other comprehensive income (loss)	10,154		10,163		0		0		0		0		0		10,163		(9)
Net increase (decrease) due to divestitures and acquisitions	(1,219)		0		0		0		0		0		0		0		(1,219)
Contributions from noncontrolling interests	3		0		0		0		0		0		0		0		3
Distributions to noncontrolling interests	(20)		0		0		0		0		0		0		0		(20)
Other	108		111		0		0		0		115		(4)		0		(3)
Balance at Jun. 30, 2020	62,818		62,234		485		4,766		(49,327)		81,294		15,847		9,169		584
Balance at Dec. 31, 2020	67,199		66,362		485		4,766		(49,322)		81,418		15,504		13,511		837
Common stock issued under stock plans	(82)		(82)		0		0		178		(260)		0		0		0
Purchase of common stock	(592)		(592)		0		0		(592)		0		0		0		0
Net income (loss) attributable to AIG or noncontrolling interests	4,080		3,975		0		0		0		0		3,975		0		105
Dividends on preferred stock	(15)		(15)		0		0		0		0		(15)		0		0
Dividends on common stock	(550)		(550)		0		0		0		0		(550)		0		0
Other comprehensive income (loss)	(3,303)		(3,302)		0		0		0		0		0		(3,302)		(1)
Net increase (decrease) due to divestitures and acquisitions	58		0		0		0		0		0		0		0		58
Contributions from noncontrolling interests	7		0		0		0		0		0		0		0		7
Distributions to noncontrolling interests	(181)		0		0		0		0		0		0		0		(181)
Other	287		287		0		0		102		164		21		0		0
Balance at Jun. 30, 2021	66,908		66,083		485		4,766		(49,634)		81,322		18,935		10,209		825
Balance at Mar. 31, 2021	63,560		62,679		485		4,766		(49,412)		81,253		19,121		6,466		881
Common stock issued under stock plans	2		2		0		0		7		(5)		0		0		0
Purchase of common stock	(230)		(230)		0		0		(230)		0		0		0		0
Net income (loss) attributable to AIG or noncontrolling interests	150		99		0		0		0		0		99		0		51
Dividends on preferred stock	(8)		(8)		0		0		0		0		(8)		0		0
Dividends on common stock	(274)		(274)		0		0		0		0		(274)		0		0
Other comprehensive income (loss)	3,742		3,743		0		0		0		0		0		3,743		(1)
Net increase (decrease) due to divestitures and acquisitions	(17)		0		0		0		0		0		0		0		(17)
Contributions from noncontrolling interests	2		0		0		0		0		0		0		0		2
Distributions to noncontrolling interests	(91)		0		0		0		0		0		0		0		(91)
Other	72		72		0		0		1		74		(3)		0		0
Balance at Jun. 30, 2021	$ 66,908		$ 66,083		$ 485		$ 4,766		$ (49,634)		$ 81,322		$ 18,935		$ 10,209		$ 825