You may check CBP web site for detail.
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zIp The following is mentioned in U.S. Customs and Border Protection Declaration Form
MwiT1sB~ q")}vN Money And Other Monetary
/']Gnt G. Instruments
m,'u_yK You may bring into or take out of the country, including
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dZ!,J by mail, as much money as you wish. However, if
sq*sb dE it is more than $10,000, you will need to report it to
syMB~g CBP. Ask the CBP officer for the Currency Reporting
R`Q9|yF\ Form (FinCen 105). The penalties for non-compliance
&ceZu=* can be severe.
euQd “Money” means monetary instruments and includes U.S.
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BjP or foreign coins currently in circulation, currency, travelers’
u" nyx0< checks in any form, money orders, and negotiable
A07FjT5w8 instruments or investment securities in bearer form.