Chevron Corporation is a holding company. Chevron, through its subsidiaries, is engaged in petroleum operations, chemicals operations, mining operations, and power and energy services. The Company operates through two business segments: upstream and downstream. Its upstream operations consist primarily of exploring for, developing and producing crude oil and natural gas; processing, liquefaction, transportation and regasification associated with liquefied natural gas; transporting crude oil by international oil export pipelines; transporting, storage and marketing of natural gas; and a gas-to-liquids project. Downstream operations consist of refining crude oil into petroleum products; transporting crude oil and refined products by pipeline, marine vessel, motor equipment and rail car, and manufacturing and marketing of commodity petrochemicals, plastics for industrial uses, and fuel and lubricant additives. The Company�s other businesses include mining, and power and energy services.