You may check CBP web site for detail.
q2Rf@nt (fd[P|G_] http://www.cbp.gov P CsK() thV Tdz The following is mentioned in U.S. Customs and Border Protection Declaration Form
VKf6|ae Gt'/D>FE0 Money And Other Monetary
@Z=wE3T@ Instruments
CXa Ld7nMX You may bring into or take out of the country, including
sS'{QIRC' by mail, as much money as you wish. However, if
BK*UR+, it is more than $10,000, you will need to report it to
cyb(\ fsC CBP. Ask the CBP officer for the Currency Reporting
pE(sV{PD Form (FinCen 105). The penalties for non-compliance
qvN
"1=nJ can be severe.
&E]"c]i+ “Money” means monetary instruments and includes U.S.
z`@z or foreign coins currently in circulation, currency, travelers’
Bt6xV<jD checks in any form, money orders, and negotiable
tj#b_u z instruments or investment securities in bearer form.