You may check CBP web site for detail.
L8 @1THY sp`Dvqx0 http://www.cbp.gov )\^-2[; {]|J5Dgfe The following is mentioned in U.S. Customs and Border Protection Declaration Form
FxtI"g\0 \uMLY<]P Money And Other Monetary
5/z/>D; Instruments
VLN_w$iEq You may bring into or take out of the country, including
TuqH*{NNy9 by mail, as much money as you wish. However, if
`y* }lg T it is more than $10,000, you will need to report it to
G*v,GR CBP. Ask the CBP officer for the Currency Reporting
:eLVC7' Form (FinCen 105). The penalties for non-compliance
jF*j0PkNdb can be severe.
&jr3B;g!C “Money” means monetary instruments and includes U.S.
lb1Xsgm{ or foreign coins currently in circulation, currency, travelers’
`@|$,2[C checks in any form, money orders, and negotiable
N,U8YO instruments or investment securities in bearer form.