RIO DE JANEIRO — The National Security Agency spied on Petrobras, Brazil’s giant national oil company, according to a report here on Sunday night by the Globo television network, in the latest revelation of the agency’s surveillance methods that have raised tension between Brazil and the United States.

Still, details were sparse in the report as to precisely what information the N.S.A. may have obtained from spying on Petrobras, raising questions about what objectives the agency could have in targeting the company, which is controlled by Brazil’s government and ranks among the world’s largest oil producers.

The report, based on documents obtained from Edward J. Snowden, the former N.S.A. contractor, said Petrobras figured among other prominent N.S.A. targets, including Google; the Society for Worldwide Interbank Financial Telecommunication, or Swift, a consortium based in Belgium that aims to allow banks around the world to securely exchange financial information; and France’s Ministry of Foreign Affairs.

It was the latest in a series of reports here in which Glenn Greenwald, an American journalist living in Rio de Janeiro who is working with Globo, has shed light on N.S.A. activities in Latin America from documents given to him by Mr. Snowden.