Halliburton Company, an American multinational corporation, is one of the world’s largest oil field service companies, with operations in more than 80 countries. It owns hundreds of subsidiaries, affiliates, branches, brands, and divisions worldwide and employs approximately 70,000 people. Halliburton’s major business segment is the Energy Services Group (ESG). ESG provides technical products and services for petroleum and natural gas exploration and production. Halliburton’s former subsidiary, KBR, is a major construction company of refineries, oil fields, pipelines, and chemical plants. Halliburton announced on April 5, 2007 that it had sold the division and severed its corporate relationship with KBR, which had been its contracting, engineering and construction unit as a part of the company.