You may check CBP web site for detail.
GY<Y, *-Y77p7u http://www.cbp.gov 5?k_Q"~ nTY`1w.
; The following is mentioned in U.S. Customs and Border Protection Declaration Form
('W#r" HGB96,o f9 Money And Other Monetary
Xca Y'k# Instruments
u~Q0V J~ You may bring into or take out of the country, including
(iGk]Rtzt by mail, as much money as you wish. However, if
KwWqsuju it is more than $10,000, you will need to report it to
tQ'E"u1 CBP. Ask the CBP officer for the Currency Reporting
z]Z>+| Form (FinCen 105). The penalties for non-compliance
P f6rr9 can be severe.
%B3E9<9>U “Money” means monetary instruments and includes U.S.
l},*^Sn<5 or foreign coins currently in circulation, currency, travelers’
s>~!r.GC checks in any form, money orders, and negotiable
88d0`6K-9 instruments or investment securities in bearer form.