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CONSOLIDATED BALANCE SHEETS (Parenthetical - equity) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
AIG shareholders' equity:    
Common stock, par value (in dollars per share) $ 2.5us-gaap_CommonStockParOrStatedValuePerShare $ 2.5us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 5,000,000,000us-gaap_CommonStockSharesAuthorized 5,000,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 1,906,671,492us-gaap_CommonStockSharesIssued 1,906,645,689us-gaap_CommonStockSharesIssued
Treasury stock, shares of common stock 530,744,521us-gaap_TreasuryStockShares 442,582,366us-gaap_TreasuryStockShares
Non-redeemable noncontrolling interests, associated with businesses held for sale $ 0aig_NoncontrollingInterestHeldForSale $ 100aig_NoncontrollingInterestHeldForSale