You may check CBP web site for detail.
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(RdJ-, http://www.cbp.gov ~W'DEpq_ ;5a$OM The following is mentioned in U.S. Customs and Border Protection Declaration Form
~G@NWF?7 [hJ1]RW8 Money And Other Monetary
:]"5UY?oF Instruments
{1GJ,['qL You may bring into or take out of the country, including
`At.$3B by mail, as much money as you wish. However, if
J?4{#p it is more than $10,000, you will need to report it to
r}U6LE?> CBP. Ask the CBP officer for the Currency Reporting
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Tuef Form (FinCen 105). The penalties for non-compliance
e8a^"Z`a can be severe.
LPs%^*8(2 “Money” means monetary instruments and includes U.S.
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Q2i or foreign coins currently in circulation, currency, travelers’
j:9M${~ checks in any form, money orders, and negotiable
<y 4(!z" instruments or investment securities in bearer form.