You may check CBP web site for detail.
-2Ub'*qK C w$y http://www.cbp.gov .@[+05Yw A Ys<IMQ The following is mentioned in U.S. Customs and Border Protection Declaration Form
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rVtxzH Money And Other Monetary
Y$,]~Qzq Instruments
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ln You may bring into or take out of the country, including
} O!LTD by mail, as much money as you wish. However, if
_N*4 3O` it is more than $10,000, you will need to report it to
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D CBP. Ask the CBP officer for the Currency Reporting
OSq"q-Q Form (FinCen 105). The penalties for non-compliance
sS+9ly{9J can be severe.
2Q Bq “Money” means monetary instruments and includes U.S.
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ej or foreign coins currently in circulation, currency, travelers’
v"bOv"!al checks in any form, money orders, and negotiable
'X[3y^q instruments or investment securities in bearer form.