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SHARE-BASED COMPENSATION AND OTHER PLANS (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
RSUs
Dec. 31, 2012
AIG Plans
Dec. 31, 2012
AIG Plans
Maximum
Jan. 02, 2012
AIG DCPPP
RSUs
Dec. 31, 2012
SICO Plans
Change in number of shares          
Unvested at the beginning of the period (in shares)   48,892     195,907
Granted (in shares)   241,268      
Vested (in shares)   (240,765)   (38,959) (48,391)
Forfeited (in shares)   (10,146)     (27,572)
Unvested at the end of the period (in shares)   39,249     119,944
Change in Weighted Average Grant-Date Fair Value          
Unvested at the beginning of the period (in dollars per share)   $ 74.57     $ 1,209.45
Granted (in dollars per share)   $ 31.04      
Vested (in dollars per share)   $ 34.47     $ 747.11
Forfeited (in dollars per share)   $ 92.70     $ 1,210.60
Unvested at the end of the period (in dollars per share)   $ 48.29     $ 1,197.96
Total unrecognized compensation cost (net of expected forfeitures) and the weighted-average periods over which those costs are expected to be recognized          
Unrecognized Compensation Cost $ 14   $ 1   $ 46
Weighted-Average Period 1 year   1 year   5 years 5 months 8 days
Expected Period 2 years       27 years