Harnessing its heritage of Western technical know-how, Occidental Petroleum engages in oil and gas exploration and production and makes basic chemicals, plastics, and petrochemicals. In 2015 it reported proved reserves of 2.2 billion barrels of oil equivalent, primarily from assets in the US, the Middle East, North Africa, and Latin America. Subsidiary Occidental Chemical (OxyChem) produces acids, chlorine, and specialty products, and owns Oxy Vinyls, the #1 maker of polyvinyl chloride (PVC) resin in North America. Occidental Petroleum's midstream and marketing units gather, treat, process, transport, store, trade, and market crude oil, natural gas, NGLs, condensate, and CO2, and generate and market power.