You may check CBP web site for detail.
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^` The following is mentioned in U.S. Customs and Border Protection Declaration Form
2uG0/7 HqI t74+ Money And Other Monetary
(H)2s Y Instruments
%F\?R[^5 You may bring into or take out of the country, including
;E@G`=0St by mail, as much money as you wish. However, if
VK}fsOnj0 it is more than $10,000, you will need to report it to
f_[<L CBP. Ask the CBP officer for the Currency Reporting
6Ca(U' Form (FinCen 105). The penalties for non-compliance
I{
HN67O can be severe.
L/wD7/ODr “Money” means monetary instruments and includes U.S.
Ol1e/Wv or foreign coins currently in circulation, currency, travelers’
HKF H/eV checks in any form, money orders, and negotiable
\x)n>{3C instruments or investment securities in bearer form.