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INVESTMENTS (Details - Increase (decrease) in unrealized appreciation (depreciation)) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Available-for-sale Securities Disclosures    
Increase (decrease) in unrealized appreciation (depreciation) of investments $ 1,271us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss $ 3,939us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
Fixed maturity securities    
Available-for-sale Securities Disclosures    
Increase (decrease) in unrealized appreciation (depreciation) of investments 2,156us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember		 3,994us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Equity securities    
Available-for-sale Securities Disclosures    
Increase (decrease) in unrealized appreciation (depreciation) of investments (382)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_InvestmentTypeAxis
= aig_EquityAvailableForSaleSecuritiesMember		 (128)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_InvestmentTypeAxis
= aig_EquityAvailableForSaleSecuritiesMember
Other investments    
Available-for-sale Securities Disclosures    
Increase (decrease) in unrealized appreciation (depreciation) of investments $ (503)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_InvestmentTypeAxis
= aig_OtherInvestmentMember		 $ 73us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
/ us-gaap_InvestmentTypeAxis
= aig_OtherInvestmentMember