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FAIR VALUE MEASUREMENTS (Details - Investments in Certain Entities Carried at Fair Value Using Net Asset Value Per Share) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent $ 8,746us-gaap_AlternativeInvestmentsFairValueDisclosure $ 8,359us-gaap_AlternativeInvestmentsFairValueDisclosure
Unfunded Commitments 972us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments 986us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Private equity funds:    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 3,035us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
3,160us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Unfunded Commitments 948us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
980us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Average original expected lives 10 years  
Second investment redemption notice period 2 years  
Private equity funds: | Expected remaining lives of 3 years or less    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
First threshold level of remaining lives 3 years  
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part 85.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage
/ aig_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriodAxis
= aig_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriodCategoryOneMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
 
Private equity funds: | Expected remaining lives of less than 4 to 6 years    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Second threshold level of remaining lives 6 years  
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part 5.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage
/ aig_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriodAxis
= aig_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriodCategoryTwoMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
 
Private equity funds: | Expected remaining lives of less than 7 to 10 years    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Third threshold level of remaining lives 10 years  
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part 10.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage
/ aig_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriodAxis
= aig_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriodCategoryThreeMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
 
Leveraged buyout    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 2,123us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_LeveragedBuyoutMember
2,275us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_LeveragedBuyoutMember
Unfunded Commitments 461us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_LeveragedBuyoutMember
450us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_LeveragedBuyoutMember
Real Estate / Infrastructure    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 370us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_RealEstateAndInfrastructurePrivateEquityFundsMember
384us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_RealEstateAndInfrastructurePrivateEquityFundsMember
Unfunded Commitments 205us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_RealEstateAndInfrastructurePrivateEquityFundsMember
227us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_RealEstateAndInfrastructurePrivateEquityFundsMember
Venture capital    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 133us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_VentureCapitalFundsMember
121us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_VentureCapitalFundsMember
Unfunded Commitments 30us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_VentureCapitalFundsMember
26us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_VentureCapitalFundsMember
Distressed    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 161us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_DistressedPrivateEquityFundsMember
164us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_DistressedPrivateEquityFundsMember
Unfunded Commitments 43us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_DistressedPrivateEquityFundsMember
43us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_DistressedPrivateEquityFundsMember
Other..    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 248us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_OtherPrivateEquityFundsMember
216us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_OtherPrivateEquityFundsMember
Unfunded Commitments 209us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_OtherPrivateEquityFundsMember
234us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_OtherPrivateEquityFundsMember
Hedge funds:    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 5,711us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
5,199us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
Unfunded Commitments 24us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
6us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
Hedge fund investments redeemable monthly (as a percent) 14.00%aig_PercentageOfMonthlyRedemption
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
 
Hedge fund investments redeemable quarterly (as a percent) 48.00%aig_PercentageOfQuarterlyRedemption
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
 
Hedge fund investments redeemable semi-annually (as a percent) 15.00%aig_PercentageOfSemiAnnualRedemption
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
 
Hedge fund investments redeemable annually (as a percent) 23.00%aig_PercentageOfAnnualRedemption
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
 
Percentage of hedge fund investments that cannot be redeemed, either in whole or in part 44.00%us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareRedemptionRestrictionPercentage
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
 
Event-driven    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 1,182us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEventDrivenMember
1,109us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEventDrivenMember
Unfunded Commitments 0us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEventDrivenMember
0us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEventDrivenMember
Long-short    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 2,750us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
2,428us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
Unfunded Commitments 1us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
1us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsEquityLongShortMember
Macro    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 531us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_HedgeFundsMacroValueMember
498us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_HedgeFundsMacroValueMember
Unfunded Commitments 0us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_HedgeFundsMacroValueMember
0us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_HedgeFundsMacroValueMember
Distressed.    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 736us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_DistressedHedgeFundsMember
731us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_DistressedHedgeFundsMember
Unfunded Commitments 23us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_DistressedHedgeFundsMember
5us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_DistressedHedgeFundsMember
Emerging markets    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 339us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_EmergingMarketsHedgeFundsMember
308us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_EmergingMarketsHedgeFundsMember
Unfunded Commitments 0us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_EmergingMarketsHedgeFundsMember
0us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_EmergingMarketsHedgeFundsMember
Other hedge funds    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using Net Asset Value Per Share or its equivalent 173us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_OtherHedgeFundsMember
125us-gaap_AlternativeInvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= aig_OtherHedgeFundsMember
Unfunded Commitments $ 0us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_OtherHedgeFundsMember
$ 0us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= aig_OtherHedgeFundsMember