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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Available-for-sale Securities Disclosures      
Amortized cost $ 242,114us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis   $ 243,307us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fair value 264,588us-gaap_AvailableForSaleSecurities   264,254us-gaap_AvailableForSaleSecurities
Purchased Credit Impaired (PCI) Securities      
Available-for-sale Securities Disclosures      
Contractually required payments (principal and interest) 31,562us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
   
Cash flows expected to be collected 25,480us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
   
Recorded investment in acquired securities 16,986aig_CertainSecuritiesAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtRecordedInvestment
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
   
Outstanding principal balance 17,362aig_PrincipalAmountOfSecurityOutstanding
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
  16,962aig_PrincipalAmountOfSecurityOutstanding
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Amortized cost 12,601us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
  12,216us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Fair value 13,788us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
  13,462us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Changes in activity for the accretable yield on PCI securities:      
Balance, beginning of year 6,865us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYield
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
6,940us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYield
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Newly purchased PCI securities 245us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldAdditions
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
522us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldAdditions
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Disposals 0us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
0us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Accretion (220)us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldAccretion
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
(212)us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldAccretion
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Effect of changes in interest rate indices (138)aig_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldChangeIncreaseDecreaseInInterestRateIndices
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
(59)aig_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldChangeIncreaseDecreaseInInterestRateIndices
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Net reclassification from non-accretable difference, including effects of prepayments 13aig_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
(21)aig_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Balance, end of year $ 6,765us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYield
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
$ 7,170us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYield
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember