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OWNERSHIP (Details)
Dec. 31, 2014
Fairholme Funds, Fairholme Capital Management and Mr. Berkowitz | After amendment  
Beneficial Ownership [Line Items]  
Common stock and warrants deemed beneficially held 75,755,659aig_BeneficialOwnershipSharesWarrantsHeld
/ aig_BeneficialOwnershipAxis
= aig_FairholmeFundsFairholmeCapitalManagementAndBruceBerkowitzMember
/ aig_ScheduleAmendmentAxis
= aig_AfterAmendmentMember
Ownership interest (as a percent) 5.30%aig_BeneficialOwnershipPercentage
/ aig_BeneficialOwnershipAxis
= aig_FairholmeFundsFairholmeCapitalManagementAndBruceBerkowitzMember
/ aig_ScheduleAmendmentAxis
= aig_AfterAmendmentMember
Common stock deemed to be beneficially owned (in shares) 51,283,896aig_BeneficialOwnershipSharesHeld
/ aig_BeneficialOwnershipAxis
= aig_FairholmeFundsFairholmeCapitalManagementAndBruceBerkowitzMember
/ aig_ScheduleAmendmentAxis
= aig_AfterAmendmentMember
Warrants deemed beneficially held 24,471,763aig_BeneficialOwnershipWarrantsHeld
/ aig_BeneficialOwnershipAxis
= aig_FairholmeFundsFairholmeCapitalManagementAndBruceBerkowitzMember
/ aig_ScheduleAmendmentAxis
= aig_AfterAmendmentMember
The Vanguard Group  
Beneficial Ownership [Line Items]  
Common stock and warrants deemed beneficially held 71,820,823aig_BeneficialOwnershipSharesWarrantsHeld
/ aig_BeneficialOwnershipAxis
= aig_TheVanguardGroupMember
Ownership interest (as a percent) 5.10%aig_BeneficialOwnershipPercentage
/ aig_BeneficialOwnershipAxis
= aig_TheVanguardGroupMember
Blackrock, Inc | After amendment  
Beneficial Ownership [Line Items]  
Common stock and warrants deemed beneficially held 87,211,630aig_BeneficialOwnershipSharesWarrantsHeld
/ aig_BeneficialOwnershipAxis
= aig_BlackrockMember
/ aig_ScheduleAmendmentAxis
= aig_AfterAmendmentMember
Ownership interest (as a percent) 6.20%aig_BeneficialOwnershipPercentage
/ aig_BeneficialOwnershipAxis
= aig_BlackrockMember
/ aig_ScheduleAmendmentAxis
= aig_AfterAmendmentMember
Department of the Treasury | Warrants  
Beneficial Ownership [Line Items]  
Number of series of warrants owned 2aig_NumberOfSeriesOfWarrantsOwned
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_PrincipalOwnerMember