You may check CBP web site for detail.
QM"\;l?? d~G, * http://www.cbp.gov a-A>A_. L7gZ4Hu=` The following is mentioned in U.S. Customs and Border Protection Declaration Form
!vaS fL*] !zu YO3: Money And Other Monetary
xD:t$~ Instruments
c Nhy.Z~D You may bring into or take out of the country, including
J$]-)`[G& by mail, as much money as you wish. However, if
)@IDmz> it is more than $10,000, you will need to report it to
\o&\r)FX
CBP. Ask the CBP officer for the Currency Reporting
4P>[]~S Form (FinCen 105). The penalties for non-compliance
S,=#b
4\#% can be severe.
z
?3G` “Money” means monetary instruments and includes U.S.
Eeumi#$Z or foreign coins currently in circulation, currency, travelers’
MR) *Xh checks in any form, money orders, and negotiable
Y]u6f c instruments or investment securities in bearer form.