Imperial Oil Limited explores for, produces, and sells crude oil and natural gas in Canada. The company operates through three segments: Upstream, Downstream, and Chemical. The Upstream segment explores for and produces crude oil, natural gas, synthetic oil, and bitumen. As of December 31, 2017, this segment had 450 million oil-equivalent barrels of proved undeveloped reserves. The Downstream segment is involved in the transportation and refining of crude oil, as well as blending, distribution, and marketing of refined products. This segment also maintains a distribution system to handle bulk and packaged petroleum products moving from refineries to market by pipeline, tanker, rail, and road transport; and owns and operates natural gas liquids and products pipelines in Alberta, Manitoba, and Ontario, as well as holds interests in crude oil and products pipeline companies. In addition, this segment sells petroleum products under the Esso and Mobil brands to motoring public through approximately 1,800 Esso retail sites. It supplies petroleum products to industrial and transportation customers, independent marketers, and resellers, as well as other refiners serving agriculture, residential heating, and commercial markets through branded resellers. The Chemical segment manufactures and markets various petrochemicals and polyethylene, including benzene, aromatic and aliphatic solvents, plasticizer intermediates, and polyethylene resins. Imperial Oil Limited was founded in 1880 and is headquartered in Calgary, Canada. Imperial Oil Limited is a subsidiary of Exxon Mobil Corporation.