Whether you travel domestically or internationally, you need to have some documents in hand.
National travel: RG or other official document with photo.
International travel: Valid Brazilian passport.
In the case of travel to Argentina, Uruguay, Paraguay, Bolivia, Chile, Peru, Ecuador and Colombia, the RG is also accepted as a travel document.
Some countries require entry visas. Others request documents that prove certain vaccines. Consult the consulates of the countries you are visiting in advance in order to meet the specific requirements.