You may check CBP web site for detail.
{KsVK4\r _Qg{ ; http://www.cbp.gov 3<3t;&e QY=QQG The following is mentioned in U.S. Customs and Border Protection Declaration Form
$82zy q ]o `4Z" Money And Other Monetary
Cc*
|Zw Instruments
],Ab cTX You may bring into or take out of the country, including
Bu':2"7 by mail, as much money as you wish. However, if
v =>3"!* it is more than $10,000, you will need to report it to
dX0x
Kk%# CBP. Ask the CBP officer for the Currency Reporting
q 7` Form (FinCen 105). The penalties for non-compliance
:/~_sJt C can be severe.
K)Ge “Money” means monetary instruments and includes U.S.
9!cW or foreign coins currently in circulation, currency, travelers’
eWw y28t checks in any form, money orders, and negotiable
3}yraX6r! instruments or investment securities in bearer form.