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	(78)		(78)		0		0		153		(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	2,327		1,763		0		0		0		0		1,763		0		564
Dividends on preferred stock	(7)		(7)		0		0		0		0		(7)		0		0
Dividends on common stock	(557)		(557)		0		0		0		0		(557)		0		0
Other comprehensive income (loss)	6,420		6,404		0		0		0		0		0		6,404		16
Current and deferred income taxes	0		0		0		0		0		0		0		0		0
Net increase (decrease) due to acquisitions and consolidations	96		0		0		0		0		0		0		0		96
Contributions from noncontrolling interests	2		0		0		0		0		0		0		0		2
Distributions to noncontrolling interests	(69)		0		0		0		0		0		0		0		(69)
Other	177		168		0		0		0		174		(6)		0		9
Balance at Jun. 30, 2019	66,105		64,539		485		4,766		(48,991)		81,211		22,077		4,991		1,566
Balance at Mar. 31, 2019	62,093		60,787		485		4,766		(48,999)		81,148		21,259		2,128		1,306
Preferred stock issued	0		0		0		0		0		0		0		0		0
Common stock issued under stock plans	(1)		(1)		0		0		8		(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	1,390		1,109		0		0		0		0		1,109		0		281
Dividends on preferred stock	(7)		(7)		0		0		0		0		(7)		0		0
Dividends on common stock	(279)		(279)		0		0		0		0		(279)		0		0
Other comprehensive income (loss)	2,873		2,863		0		0		0		0		0		2,863		10
Current and deferred income taxes	1		1		0		0		0		1		0		0		0
Net increase (decrease) due to acquisitions and consolidations	(12)		0		0		0		0		0		0		0		(12)
Contributions from noncontrolling interests	(10)		0		0		0		0		0		0		0		(10)
Distributions to noncontrolling interests	(10)		0		0		0		0		0		0		0		(10)
Other	67		66		0		0		0		71		(5)		0		1
Balance at Jun. 30, 2019	66,105		64,539		485		4,766		(48,991)		81,211		22,077		4,991		1,566
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	(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 decrease due to deconsolidation	(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		60,173		485		4,766		(49,334)		81,188		24,062		(994)		1,670
Preferred stock issued	0		0		0		0		0		0		0		0		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 decrease due to deconsolidation	(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