Chevron Corporation — Chevron Corporation, through its subsidiaries, engages in the integrated energy and chemicals operations. It operates through Upstream and Downstream segments. The Upstream segment engages in the exploration for, development, production, and transportation of crude oil and natural gas; processing, liquefaction, transportation, and regasification of liquefied natural gas; transportation of crude oil through pipelines; transportation, storage, and marketing of natural gas; carbon capture and storage; and operation of a gas-to-liquids plant. The Downstream segment refines crude oil into petroleum….· via yahoo