You may check CBP web site for detail.
%L13Jsw XCIa2Syo http://www.cbp.gov iE^a%|?} _7#tgZyv The following is mentioned in U.S. Customs and Border Protection Declaration Form
ff}a <w IbJ[Og^Qyu Money And Other Monetary
s9rtXBJP Instruments
bLM"t0 You may bring into or take out of the country, including
aR)en{W by mail, as much money as you wish. However, if
f3TlJ!!U it is more than $10,000, you will need to report it to
)Bn>/- CBP. Ask the CBP officer for the Currency Reporting
,#bb8+z&p Form (FinCen 105). The penalties for non-compliance
x:?a;m uf can be severe.
8q?;Hg “Money” means monetary instruments and includes U.S.
|^PLZ> or foreign coins currently in circulation, currency, travelers’
!b]2q%XM checks in any form, money orders, and negotiable
_0W;)v instruments or investment securities in bearer form.