This is a technicality, no doubt, but Brazilians require only a national ID card (RG) to enter and leave Brazil plus whatever documents they require to enter their destination country, and leave the country from which they embark to return to Brazil. While usually in advisable, this absolutely works, as Mrs JBC found when we forgot to renew her Brazilian passport. We embarked on a voyage to seven countries with no Brazilian passport, with entry and exit to Brazil on the RG. Nobody blinked, including our air carriers AF and KL.. The same easy time a week later for a U.S. trip on AA.