INSURANCE LIABILITIES (Details - Reconciliation of change in net ultimates to prior year development) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Reconciliation Of Change In Net Ultimates To Prior Year Development [Line Items]
Total, prior years, excluding discount and amortization of deferred gain	$ (15)	$ (40)

Represents the increase decrease in the liability for unpaid claims and claims adjustment expense related to the period for claims incurred in prior reporting periods and related claims settlement costs, excluding discount and amortization of deferred gain.

No definition available.

Name:	aig_ChangesInUnpaidNetLossReservesRelatedToLossesAndLossAdjustmentIncurredInPriorYearsExcludingDiscountAndDeferredGainAmortization
Namespace Prefix:	aig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration