You may check CBP web site for detail.
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http://www.cbp.gov =dDr:Y<@* $,
@,(M`i} The following is mentioned in U.S. Customs and Border Protection Declaration Form
3T84f[CFJ uwo\FI Money And Other Monetary
6&s"
"J)3 Instruments
1XPYI You may bring into or take out of the country, including
$s"{C"4q by mail, as much money as you wish. However, if
?:+sjHzXT it is more than $10,000, you will need to report it to
cPbAR' CBP. Ask the CBP officer for the Currency Reporting
c=#V*< Form (FinCen 105). The penalties for non-compliance
c01i!XS can be severe.
EEdU\9DH( “Money” means monetary instruments and includes U.S.
"1|\V.>>; or foreign coins currently in circulation, currency, travelers’
;?.w!|6 checks in any form, money orders, and negotiable
w$4*/D}Y instruments or investment securities in bearer form.