Marathon Oil Corp. engages in the exploration, production, and marketing of liquid hydrocarbons and natural gas. It operates through the following two segments: United States (U. Read More S.) and International. The U. S. segment engages in oil and gas exploration, development and production activities in the U.S. The International segment engages in oil and gas development and production across international locations primarily in Equatorial Guinea and the United Kingdom. The company was founded in 1887 and is headquartered in Houston, TX.