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INVESTMENTS (Details - Amortized cost and fair value of fixed maturity securities available for sale by contractual maturity) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available-for-sale Securities Disclosures    
Fixed Maturity Securities in a Loss Position Available for Sale , Amortized Cost, Total $ 243,797us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 245,237us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fixed Maturity Securities Available for Sale, Fair Value, Total 260,822us-gaap_AvailableForSaleSecuritiesDebtSecurities 259,859us-gaap_AvailableForSaleSecuritiesDebtSecurities
Fixed Maturity Securities in a Loss Position AFS    
Available-for-sale Securities Disclosures    
Due in one year or less, Amortized Cost 655us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
637us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Due after one year through five years, Amortized Cost 4,452us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
6,669us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Due after five years through ten years, Amortized Cost 8,569us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
12,873us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Due after ten years, Amortized Cost 8,280us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
10,255us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Mortgage-backed, asset-backed and collateralized, Amortized Cost 15,020us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
17,120us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Fixed Maturity Securities in a Loss Position Available for Sale , Amortized Cost, Total 36,976us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
47,554us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Due in one year or less, Fair Value 632us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
620us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Due after one year through five years, Fair Value 4,314us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
6,529us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Due after five years through ten years, Fair Value 8,170us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
12,338us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Due after ten years, Fair Value 7,835us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
9,607us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Mortgage-backed, asset-backed and collateralized, Fair Value 14,554us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
16,641us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Fixed Maturity Securities Available for Sale, Fair Value, Total 35,505us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
45,735us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ aig_GrossUnrealizedGainLossPositionAxis
= aig_UnrealizedLossPositionMember
Bonds available for sale    
Available-for-sale Securities Disclosures    
Due in one year or less, Amortized Cost 10,434us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
9,821us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Due after one year through five years, Amortized Cost 48,034us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
48,352us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Due after five years through ten years, Amortized Cost 59,209us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
62,685us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Due after ten years, Amortized Cost 62,891us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
63,168us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Mortgage-backed, asset-backed and collateralized, Amortized Cost 61,546us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
59,281us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Fixed Maturity Securities in a Loss Position Available for Sale , Amortized Cost, Total 242,114us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
243,307us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Due in one year or less, Fair Value 10,590us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
9,975us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Due after one year through five years, Fair Value 50,920us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
50,873us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Due after five years through ten years, Fair Value 62,855us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
65,889us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Due after ten years, Fair Value 70,275us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
69,442us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Mortgage-backed, asset-backed and collateralized, Fair Value 66,182us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
63,680us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Fixed Maturity Securities Available for Sale, Fair Value, Total $ 260,822us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
$ 259,859us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember