You may check CBP web site for detail.
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I9~N[ %BYlbEx http://www.cbp.gov C)3$";$5) @=zBF'<.9 The following is mentioned in U.S. Customs and Border Protection Declaration Form
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o Kj<<&_B.H Money And Other Monetary
;uA_gn! Instruments
E*T84Jh6 You may bring into or take out of the country, including
->"h5h by mail, as much money as you wish. However, if
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L[AgCg it is more than $10,000, you will need to report it to
DRmh(T CBP. Ask the CBP officer for the Currency Reporting
d8 BK/b Form (FinCen 105). The penalties for non-compliance
B|q3;P can be severe.
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m'`5 “Money” means monetary instruments and includes U.S.
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a/"| or foreign coins currently in circulation, currency, travelers’
&_%+r5 checks in any form, money orders, and negotiable
<GFB'`L instruments or investment securities in bearer form.