BRUSSELS (Reuters) – The European Commission is working with the United States on the final details of a commercial data-sharing deal that was put up for renegotiation following leaks two years ago that exposed U.S. mass surveillance practices, a document seen by Reuters showed. The European Commission, the EU executive, has been negotiating with the United States since January 2014 to reform an existing agreement allowing companies to transfer data easily between the two areas, known as “Safe Harbour”.