You may check CBP web site for detail.
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T4G http://www.cbp.gov QlFZO4 P3| $h9='0Wi0' The following is mentioned in U.S. Customs and Border Protection Declaration Form
B
(/U3}w- qJ!Z~-hS Money And Other Monetary
rRES8/ Instruments
Oh.ZPG= You may bring into or take out of the country, including
Mkp/0|Q* by mail, as much money as you wish. However, if
){s*n=KIO it is more than $10,000, you will need to report it to
1RLY $M CBP. Ask the CBP officer for the Currency Reporting
qVjWV$j Form (FinCen 105). The penalties for non-compliance
P=L$;xgp can be severe.
;P &y,:<m: “Money” means monetary instruments and includes U.S.
%ugHhS! or foreign coins currently in circulation, currency, travelers’
$$i.O} checks in any form, money orders, and negotiable
5 v^yQ<70 instruments or investment securities in bearer form.