Exxon Mobil is a vertically integrated energy conglomerate that explores for and produces crude oil and natural gas.  The company and its subsidiaries also manufacture petroleum and well as transport its energy products.  Exxon is also engaged in the manufacturing of olefins, polyethylene, aromatics, and polypropylene plastics.  The company has a limited interest in some power generation plants.  The company is divided into 3 segments: Upstream, Chemicals, and Downstream.