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INVESTMENTS (Details - Purchased Credit Impaired (PCI) Securities) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 243,307us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 248,531us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fair value 264,254us-gaap_AvailableForSaleSecurities 261,930us-gaap_AvailableForSaleSecurities
Purchased Credit Impaired (PCI) Securities    
Schedule of Available-for-sale Securities [Line Items]    
Contractually required payments (principal and interest) 30,520us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Cash flows expected to be collected 24,561us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Recorded investment in acquired securities 16,311aig_CertainSecuritiesAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtRecordedInvestment
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
 
Outstanding principal balance 16,962aig_PrincipalAmountOfSecurityOutstanding
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
14,741aig_PrincipalAmountOfSecurityOutstanding
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Amortized cost 12,216us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
10,110us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Fair value 13,462us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
11,338us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Changes in activity for the accretable yield on PCI securities:    
Balance, beginning of year 6,940us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYield
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
4,766us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYield
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Newly purchased PCI securities 1,289us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldAdditions
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
1,773us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldAdditions
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Disposals 0us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
(60)us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldDisposalsOfLoans
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Accretion (880)us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldAccretion
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
(719)us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldAccretion
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Effect of changes in interest rate indices (542)aig_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldChangeIncreaseDecreaseInInterestRateIndices
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
302aig_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldChangeIncreaseDecreaseInInterestRateIndices
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Net reclassification from non-accretable difference, including effects of prepayments 58aig_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
878aig_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
Balance, end of year $ 6,865us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYield
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember
$ 6,940us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAccretableYield
/ us-gaap_InvestmentTypeAxis
= aig_PurchasedCreditImpairedSecuritiesMember