You may check CBP web site for detail.
19j"Zxdg Y DV{0|E http://www.cbp.gov v1O 1-aM #AO?<L The following is mentioned in U.S. Customs and Border Protection Declaration Form
` G-V
% K{EDmC Money And Other Monetary
ATzFs]~K; Instruments
scQnL'
\ You may bring into or take out of the country, including
*'to#_n&W
by mail, as much money as you wish. However, if
?%A9}"q] it is more than $10,000, you will need to report it to
oT0TbZu% CBP. Ask the CBP officer for the Currency Reporting
A29R5 Form (FinCen 105). The penalties for non-compliance
kVe4#LT can be severe.
1Wr,E#+C “Money” means monetary instruments and includes U.S.
X%rsa7H3J or foreign coins currently in circulation, currency, travelers’
,7h0y checks in any form, money orders, and negotiable
.$"13" instruments or investment securities in bearer form.