Marathon Oil Corporation is a leading exploration and production company with extensive operations across four core regions - Africa, Middle East, Europe and North America. As of year-end 2014, Marathon had approximately 2.2 billion oil-equivalent barrels (BBOE) in proved reserves (80% liquids and 67% developed). The company's business is organized into three segments - North America Exploration and Production, International Exploration and Production, and Oil Sands Mining. In July 2011, Marathon completed the spin-off of its refining/sales business into a separate, independent and publicly traded company Marathon Petroleum Corporation (Ticker: MPC).