You may check CBP web site for detail.
!d<"nx[2` {x'GJtpb http://www.cbp.gov Gl1jxxd 2*(Z==XC7 The following is mentioned in U.S. Customs and Border Protection Declaration Form
$0bjKy ^w ] / Money And Other Monetary
W_m"ySQs Instruments
<%xS{!'} You may bring into or take out of the country, including
T\Uek-( by mail, as much money as you wish. However, if
x~.:64 it is more than $10,000, you will need to report it to
iA8U Yd3Q CBP. Ask the CBP officer for the Currency Reporting
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5Mrf Form (FinCen 105). The penalties for non-compliance
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can be severe.
1;Pv0&[q/ “Money” means monetary instruments and includes U.S.
f;/QJ or foreign coins currently in circulation, currency, travelers’
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^#}L checks in any form, money orders, and negotiable
h;=6VgXZ instruments or investment securities in bearer form.