You may check CBP web site for detail.
~uj;qq YRcps0Dx9 http://www.cbp.gov !'0S0a8 8C7Z{@A The following is mentioned in U.S. Customs and Border Protection Declaration Form
s>%Pd7:
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8u Money And Other Monetary
C@gXT]Q
0} Instruments
`i fiL You may bring into or take out of the country, including
H%}IuHhN) by mail, as much money as you wish. However, if
*b)Q5dw@1 it is more than $10,000, you will need to report it to
\40YGFO CBP. Ask the CBP officer for the Currency Reporting
(OmH~lSO. Form (FinCen 105). The penalties for non-compliance
S$[k Q|Am can be severe.
9[Qd)%
MO “Money” means monetary instruments and includes U.S.
p#@Z$gTH`' or foreign coins currently in circulation, currency, travelers’
NlF}{ checks in any form, money orders, and negotiable
KnzsHli,~k instruments or investment securities in bearer form.