Chevron Corporation manages its investments in subsidiaries and affiliates, and provides administrative, financial, management and technology support to the United States and international subsidiaries that engage in integrated energy and chemicals operations. The Company operates through two business segments: Upstream and Downstream. The Upstream segment consists primarily of exploring for, developing and producing and transporting 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 plant. The Downstream segment consists primarily of refining crude oil into petroleum products; marketing crude oil, refined products and lubricants; manufacturing and marketing renewable fuels; transporting crude oil and refined products, and manufacturing and marketing commodity petrochemicals.