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		145		(222)		0		0		0
Purchase of common stock	0		0		0		0		0		0		0		0		0
Net income (loss) attributable to AIG or other noncontrolling interests	937		654		0		0		0		0		654		0		283
Dividends on preferred stock	0		0		0		0		0		0		0		0		0
Dividends on common stock	(278)		(278)		0		0		0		0		(278)		0		0
Other comprehensive income (loss)	3,547		3,541		0		0		0		0		0		3,541		6
Current and deferred income taxes	(1)		(1)		0		0		0		(1)		0		0		0
Net increase (decrease) due to acquisitions and consolidations	108		0		0		0		0		0		0		0		108
Contributions from noncontrolling interests	12		0		0		0		0		0		0		0		12
Distributions to noncontrolling interests	(59)		0		0		0		0		0		0		0		(59)
Other	110		102		0		0		0		103		(1)		0		8
Balance at Mar. 31, 2019	62,093		60,787		485		4,766		(48,999)		81,148		21,259		2,128		1,306
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	(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 other 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 (decrease) due to acquisitions and consolidations	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