You may check CBP web site for detail.
4wBMBCJ;P GG%j+Ed http://www.cbp.gov 0I~xD9l9 >8>`- The following is mentioned in U.S. Customs and Border Protection Declaration Form
9s5CqB F/&Z1G. Money And Other Monetary
.T4"+FTzP Instruments
)}n`MRDB You may bring into or take out of the country, including
y\r8_rBo by mail, as much money as you wish. However, if
n1.]5c3p it is more than $10,000, you will need to report it to
tC-(GDGy5 CBP. Ask the CBP officer for the Currency Reporting
ZqS'xN:k Form (FinCen 105). The penalties for non-compliance
N7}.9%EV can be severe.
@ZD1HA,h" “Money” means monetary instruments and includes U.S.
}& `# or foreign coins currently in circulation, currency, travelers’
!t~S.`vF checks in any form, money orders, and negotiable
0(:"q!h instruments or investment securities in bearer form.