You may check CBP web site for detail.
1@n'6!]6O \&[(PNl http://www.cbp.gov Ako]34Rl, fNz(z\ The following is mentioned in U.S. Customs and Border Protection Declaration Form
K%1`LT5:~ CV)K=Br5&_ Money And Other Monetary
gFl@A} Instruments
D!&]jkUN You may bring into or take out of the country, including
"EwzuM8f by mail, as much money as you wish. However, if
I>{o]^xw-D it is more than $10,000, you will need to report it to
Uo;a$sR CBP. Ask the CBP officer for the Currency Reporting
% _nmv Form (FinCen 105). The penalties for non-compliance
+QP(ATdM can be severe.
Vllxv6/_ “Money” means monetary instruments and includes U.S.
w@pJ49 or foreign coins currently in circulation, currency, travelers’
aNP\Q23D checks in any form, money orders, and negotiable
|G_, 1$ instruments or investment securities in bearer form.