And maple shows he knows nothing... 1.4 trillion just in the fixe days after the market reopened and that was just from the NYSE. So yeah, trillions. The blue chip stocks may have recovered but plenty of smaller companies went bankrupt.
http://www.investopedia.com/financial-edge/0911/how-september-11-affected-the-u.s.-stock-market.aspx
On the first day of NYSE trading after 9/11, the market fell 684

, a 7.1% decline, setting a record for the biggest loss in exchange history for one trading day. At the close of trading that Friday, ending a week that saw the biggest losses in NYSE history, the Dow Jones was down almost 1,370

, representing a loss of over 14%. The Standard and Poor's (S&P) index lost 11.6%. An estimated $1.4 trillion in value was lost in those five days of trading.