You may check CBP web site for detail.
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K z)*{bz] http://www.cbp.gov FYC]^D 4`oKvL9 The following is mentioned in U.S. Customs and Border Protection Declaration Form
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snkMxc6c[ Money And Other Monetary
ckP AH E@ Instruments
n9&fH You may bring into or take out of the country, including
SbL7e#!! by mail, as much money as you wish. However, if
It/'R-H it is more than $10,000, you will need to report it to
&*O'qOO<2 CBP. Ask the CBP officer for the Currency Reporting
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h Form (FinCen 105). The penalties for non-compliance
J#@+1 Nt can be severe.
:f7!?^;y> “Money” means monetary instruments and includes U.S.
G2!<C-T{2 or foreign coins currently in circulation, currency, travelers’
p8.JJt^ checks in any form, money orders, and negotiable
d<OdQvW. instruments or investment securities in bearer form.