You may check CBP web site for detail.
o~ 2bk<]z +.mIC:9 http://www.cbp.gov +7^{T:^ht {HlUV33O The following is mentioned in U.S. Customs and Border Protection Declaration Form
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;>b Money And Other Monetary
VNx}ADXu ] Instruments
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Jo You may bring into or take out of the country, including
v6;XxBR6 by mail, as much money as you wish. However, if
a:7"F{D91 it is more than $10,000, you will need to report it to
)d_)CuUBe CBP. Ask the CBP officer for the Currency Reporting
1DN, Form (FinCen 105). The penalties for non-compliance
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9h can be severe.
+);o{wfW “Money” means monetary instruments and includes U.S.
m>jX4D7KZ or foreign coins currently in circulation, currency, travelers’
>pT92VN checks in any form, money orders, and negotiable
}ZlJ instruments or investment securities in bearer form.