You may check CBP web site for detail.
Em8q1P$tm> -P#PyZEH&I http://www.cbp.gov 2GeJ\1k sI\v}$(~ The following is mentioned in U.S. Customs and Border Protection Declaration Form
mU@pRjq= 8h"Val|qP Money And Other Monetary
EQ< qN<uW Instruments
:Z)a&A9v You may bring into or take out of the country, including
L~9Q7 6w by mail, as much money as you wish. However, if
Kv(2x3(" it is more than $10,000, you will need to report it to
*UBukn CBP. Ask the CBP officer for the Currency Reporting
7[=*#7}. Form (FinCen 105). The penalties for non-compliance
MiHa'90{K can be severe.
[`pp[J-~7 “Money” means monetary instruments and includes U.S.
c"HB7 or foreign coins currently in circulation, currency, travelers’
SR)jJ=R3 checks in any form, money orders, and negotiable
-yyim;Nj instruments or investment securities in bearer form.