You may check CBP web site for detail.
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~3 The following is mentioned in U.S. Customs and Border Protection Declaration Form
JW$#~"@r ty ~U~ Money And Other Monetary
ji "*=i Instruments
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!%FDL You may bring into or take out of the country, including
<_+8 c{G by mail, as much money as you wish. However, if
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it is more than $10,000, you will need to report it to
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*og CBP. Ask the CBP officer for the Currency Reporting
iH2|w Form (FinCen 105). The penalties for non-compliance
28-@Ga4 can be severe.
lH[N*9G( “Money” means monetary instruments and includes U.S.
^>>Naid or foreign coins currently in circulation, currency, travelers’
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checks in any form, money orders, and negotiable
%}@^[E) instruments or investment securities in bearer form.