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INVESTMENTS (Details - Realized gains and gross realized losses from sales or maturities) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Gross Realized Gains $ 838,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 2,764,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 3,293,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross Realized Losses 142,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 221,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 202,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Aggregate fair value of available for sale securities sold 25,300,000,000aig_AvailableForSaleSecuritiesSoldFairValue 35,900,000,000aig_AvailableForSaleSecuritiesSoldFairValue 40,300,000,000aig_AvailableForSaleSecuritiesSoldFairValue
Net realized capital gains (losses) 700,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 2,500,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 3,100,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Fixed maturity securities      
Schedule of Available-for-sale Securities [Line Items]      
Gross Realized Gains 703,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
2,634,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
2,778,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Gross Realized Losses 118,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
202,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
171,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_InvestmentTypeAxis
= aig_BondsAvailableForSaleSecuritiesMember
Equity securities available for sale      
Schedule of Available-for-sale Securities [Line Items]      
Gross Realized Gains 135,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= aig_EquityAvailableForSaleSecuritiesMember
130,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= aig_EquityAvailableForSaleSecuritiesMember
515,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= aig_EquityAvailableForSaleSecuritiesMember
Gross Realized Losses $ 24,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_InvestmentTypeAxis
= aig_EquityAvailableForSaleSecuritiesMember
$ 19,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_InvestmentTypeAxis
= aig_EquityAvailableForSaleSecuritiesMember
$ 31,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_InvestmentTypeAxis
= aig_EquityAvailableForSaleSecuritiesMember