You may check CBP web site for detail.
{O4y Y=G f""+jc1 http://www.cbp.gov z,"fr%*,N $i^#KZ}-WK The following is mentioned in U.S. Customs and Border Protection Declaration Form
|NsrO8H
"5+x6/9b Money And Other Monetary
/R2K3E# Instruments
9F
&s9(=\ You may bring into or take out of the country, including
yJj$ir i by mail, as much money as you wish. However, if
1I{^]]qw it is more than $10,000, you will need to report it to
h*2NFL~# CBP. Ask the CBP officer for the Currency Reporting
e95x,|.-_ Form (FinCen 105). The penalties for non-compliance
hd@ >p. can be severe.
xMdbS4 &! “Money” means monetary instruments and includes U.S.
&ZmHR^Flz or foreign coins currently in circulation, currency, travelers’
|V 3AA checks in any form, money orders, and negotiable
Y2)2
tzr] instruments or investment securities in bearer form.