You may check CBP web site for detail.
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*eu http://www.cbp.gov EWb(uWC8h 9jO`gWxV8* The following is mentioned in U.S. Customs and Border Protection Declaration Form
4<T*i{[ '7Mep
] Money And Other Monetary
9DOkQnnc Instruments
7deAr$?Wx You may bring into or take out of the country, including
&@YFje6Lcm by mail, as much money as you wish. However, if
%1\v7Xw{9 it is more than $10,000, you will need to report it to
K/vxzHSl CBP. Ask the CBP officer for the Currency Reporting
B;z;vrrL Form (FinCen 105). The penalties for non-compliance
<rX\LwR can be severe.
q Vm"f,ruo “Money” means monetary instruments and includes U.S.
=`qRu or foreign coins currently in circulation, currency, travelers’
By?
nd) checks in any form, money orders, and negotiable
$A;7Em instruments or investment securities in bearer form.