You may check CBP web site for detail.
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L http://www.cbp.gov 7":0CU%% X<"W@ The following is mentioned in U.S. Customs and Border Protection Declaration Form
-T-h~5 c=HL
6v< Money And Other Monetary
;zvg] % Instruments
)<jT;cT!& You may bring into or take out of the country, including
=2[cpF] by mail, as much money as you wish. However, if
u7<s_M3%N it is more than $10,000, you will need to report it to
+hS}msu' CBP. Ask the CBP officer for the Currency Reporting
[&FWR Form (FinCen 105). The penalties for non-compliance
Lpdp'9>I can be severe.
<)(STo “Money” means monetary instruments and includes U.S.
xpVYNS{c+| or foreign coins currently in circulation, currency, travelers’
)zVD!eG_9 checks in any form, money orders, and negotiable
wXsA-H/` instruments or investment securities in bearer form.