You may check CBP web site for detail.
@" ~Mglgw S|A?z)I http://www.cbp.gov ZS uMQ32 _+,2b:D: The following is mentioned in U.S. Customs and Border Protection Declaration Form
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|% {PM)D [$i Money And Other Monetary
u1 uu_* Instruments
!U"1ZsO)l You may bring into or take out of the country, including
!Xwp;P= by mail, as much money as you wish. However, if
Y/t:9Aau it is more than $10,000, you will need to report it to
Bc4{$sc"O CBP. Ask the CBP officer for the Currency Reporting
t[6 g9 e$ Form (FinCen 105). The penalties for non-compliance
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can be severe.
;3n0 bKDY “Money” means monetary instruments and includes U.S.
M} IRagm or foreign coins currently in circulation, currency, travelers’
;y#6Nx,: checks in any form, money orders, and negotiable
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uF instruments or investment securities in bearer form.