CONSOLIDATED BALANCE SHEET (Parenthetical - equity) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
AIG shareholders' equity:
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized	5,000,000,000	5,000,000,000
Common stock, shares issued	1,906,611,680	1,906,568,099
Treasury stock, shares of common stock	430,289,745	9,746,617
Non-redeemable noncontrolling interests, associated with businesses held for sale (in dollars)	$ 100	$ 100