You may check CBP web site for detail.
&m[}%e%~0 P$N5j~* http://www.cbp.gov U 0~BcFpD iC^G^ ~V+H The following is mentioned in U.S. Customs and Border Protection Declaration Form
F9r/
M"5 Qt_KUtD Money And Other Monetary
%6^nb'l'C Instruments
jq8TfJ| You may bring into or take out of the country, including
Tz.okCo]z by mail, as much money as you wish. However, if
hNkv lk'Ui it is more than $10,000, you will need to report it to
#f_'&m CBP. Ask the CBP officer for the Currency Reporting
J kAd3ls Form (FinCen 105). The penalties for non-compliance
"oFi+']* can be severe.
'@w'(}3!3R “Money” means monetary instruments and includes U.S.
s|c}9/Xe) or foreign coins currently in circulation, currency, travelers’
UzIE,A checks in any form, money orders, and negotiable
=2DK?]K; instruments or investment securities in bearer form.