You may check CBP web site for detail.
_<~Vxz9 AJ1$$c http://www.cbp.gov "BNmpP
#?d>S;)+ The following is mentioned in U.S. Customs and Border Protection Declaration Form
:IKp7BS SrU Money And Other Monetary
{ZYCnS&?CL Instruments
&i}cC4i You may bring into or take out of the country, including
h|>n3-k|p by mail, as much money as you wish. However, if
(i~%4w= it is more than $10,000, you will need to report it to
l aL4ez CBP. Ask the CBP officer for the Currency Reporting
H&Lbdu~E Form (FinCen 105). The penalties for non-compliance
Yiw^@T\H` can be severe.
=Q0)t_z_ “Money” means monetary instruments and includes U.S.
*l8vCa9Y or foreign coins currently in circulation, currency, travelers’
8; N}d)*O checks in any form, money orders, and negotiable
5lA 8e instruments or investment securities in bearer form.