You may check CBP web site for detail.
0}D-KvjyP HoL~j( { http://www.cbp.gov ?61L|vr Nuo^+z
E The following is mentioned in U.S. Customs and Border Protection Declaration Form
>~^`5a`$uI l-cW;b~ Money And Other Monetary
_hWuAJ9Qy Instruments
1y~L8!:L You may bring into or take out of the country, including
{dBB{.hX by mail, as much money as you wish. However, if
7|{ B# it is more than $10,000, you will need to report it to
HM
90Sb CBP. Ask the CBP officer for the Currency Reporting
]2PQ X4t0 Form (FinCen 105). The penalties for non-compliance
VZTmzIk.Y can be severe.
V07VwVD “Money” means monetary instruments and includes U.S.
"&Gw1.p or foreign coins currently in circulation, currency, travelers’
n_1jHJo checks in any form, money orders, and negotiable
P*7S3Td instruments or investment securities in bearer form.