BUSINESS COMBINATION (Details - Narrative) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended								12 Months Ended
	Oct. 30, 2018	Jul. 18, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Revenues			$ 12,560	$ 11,486	$ 11,631	$ 11,712	$ 12,635	$ 11,751	$ 12,502	$ 12,632	$ 47,389	$ 49,520	$ 52,367
Net income (loss)			(560)	(1,259)	931	949	(6,672)	(1,713)	1,118	1,211	61	(6,056)	(349)
Net income (loss) attributable to AIG			(622)	$ (1,259)	$ 937	$ 938	(6,660)	$ (1,739)	$ 1,130	$ 1,185	(6)	(6,084)	(849)
Goodwill			4,082				1,594				4,082	1,594	$ 1,528	$ 1,613
Other invested assets			19,341				$ 20,822				19,341	$ 20,822
Validus Holding Ltd [Member]
Business Acquisition [Line Items]
Interest acquired		100.00%
Cash consideration paid		$ 5,475
Revenues											1,400
Net income (loss)											(206)
Net income (loss) attributable to AIG											(206)
Integration and transaction costs associated with acquired business											101
Redemption price of preference shares acquired	$ 26,000
Payment to repurchase preference shares	$ 416
Goodwill		$ 1,997
Validus Holding Ltd [Member] | Series A [Member]
Business Acquisition [Line Items]
Number of preference shares acquired		6,000
Dividend rate of preference shares acquired		5.875%
Validus Holding Ltd [Member] | Series B [Member]
Business Acquisition [Line Items]
Number of preference shares acquired		10,000
Dividend rate of preference shares acquired		5.80%
Validus Holding Ltd [Member] | North America Operating Segment [Member]
Business Acquisition [Line Items]
Goodwill		$ 1,800
Validus Holding Ltd [Member] | International Operating Segment [Member]
Business Acquisition [Line Items]
Goodwill		$ 157
AlphaCat [Member]
Business Acquisition [Line Items]
Other invested assets			$ 116								$ 116