INFORMATION PROVIDED IN CONNECTION WITH OUTSTANDING DEBT (Details - Condensed Consolidating Statements of Comprehensive Income (Loss)) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income	$ 869	$ 973	$ 1,390	$ 937	$ (560)	$ (1,259)	$ 931	$ 949	$ 4,169	$ 61	$ (6,056)
Other comprehensive income (loss)									6,415	(6,293)	2,235
Comprehensive income (loss)									10,584	(6,232)	(3,821)
Comprehensive income (loss) attributable to noncontrolling interests									841	76	28
Comprehensive income (loss) attributable to AIG									9,743	(6,308)	(3,849)
AIG (As Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income									3,348	(6)	(6,084)
Other comprehensive income (loss)									6,395	(6,302)	2,235
Comprehensive income (loss)									9,743	(6,308)	(3,849)
Comprehensive income (loss) attributable to noncontrolling interests									0	0	0
Comprehensive income (loss) attributable to AIG									9,743	(6,308)	(3,849)
Validus Holdings, Ltd
Condensed Financial Statements, Captions [Line Items]
Net income									277	(262)	0
Other comprehensive income (loss)									1	0	0
Comprehensive income (loss)									278	(262)	0
Comprehensive income (loss) attributable to noncontrolling interests									0	0	0
Comprehensive income (loss) attributable to AIG									278	(262)	0
AIGLH
Condensed Financial Statements, Captions [Line Items]
Net income									278	3,268	1,279
Other comprehensive income (loss)									6,209	(4,555)	1,844
Comprehensive income (loss)									6,487	(1,287)	3,123
Comprehensive income (loss) attributable to noncontrolling interests									0	0	0
Comprehensive income (loss) attributable to AIG									6,487	(1,287)	3,123
AIGLH | Scenario, Previously Reported [Member]
Condensed Financial Statements, Captions [Line Items]
Net income										2,800	1,900
Other comprehensive income (loss)										2,500	7,800
Other Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income									4,757	(401)	(85)
Other comprehensive income (loss)									6,370	(6,810)	2,021
Comprehensive income (loss)									11,127	(7,211)	1,936
Comprehensive income (loss) attributable to noncontrolling interests									841	76	28
Comprehensive income (loss) attributable to AIG									10,286	(7,287)	1,908
Other Subsidiaries | Scenario, Previously Reported [Member]
Condensed Financial Statements, Captions [Line Items]
Other comprehensive income (loss)										12,300	17,800
Reclassification and Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income									(4,491)	(2,538)	(1,166)
Other comprehensive income (loss)									(12,560)	11,374	(3,865)
Comprehensive income (loss)									(17,051)	8,836	(5,031)
Comprehensive income (loss) attributable to noncontrolling interests									0	0	0
Comprehensive income (loss) attributable to AIG									$ (17,051)	8,836	(5,031)
Reclassification and Eliminations | Scenario, Previously Reported [Member]
Condensed Financial Statements, Captions [Line Items]
Net income										(2,000)	(1,800)
Other comprehensive income (loss)										$ (14,800)	$ (25,700)