The Williams Cos., Inc. operates as an energy infrastructure company, which explores, produces, transports, sells and processes natural gas and petroleum products. The company is headquartered in Tulsa, Oklahoma and currently employs 5,043 full-time employees. Its segments include Transmission & Gulf of Mexico, Northeast G&P, West, and Gas & NGL Marketing Services. Transmission & Gulf of Mexico segment comprises of its interstate natural gas pipelines, Transco and Northwest Pipeline, as well as natural gas gathering and processing and crude oil production handling and transportation assets in the Gulf Coast region. The Northeast G&P segment comprises of its midstream gathering, processing and fractionation businesses in the Marcellus Shale region, and the Utica Shale region of eastern Ohio. West segment comprises of its gas gathering, processing, and treating operations in the Rocky Mountain region of Colorado and Wyoming, the Barnett Shale region of north-central Texas, the Eagle Ford Shale region of South Texas, the Haynesville Shale region, and the Mid-Continent region. The Gas & NGL Marketing Services segment includes its natural gas liquids (NGL) and natural gas marketing services.