Oxy’s Midstream, Marketing and Other segment gathers, treats, processes, transports, stores, purchases and markets crude oil (including NGLs and condensate), natural gas, carbon dioxide (CO₂) and power. The segment provides low-cost services to other Oxy segments as well as third parties and operates gas plants, oil, gas and CO₂ pipeline systems and storage facilities. In addition, the marketing and trading group markets Oxy’s and third-party oil and gas, trades around the midstream and marketing segment assets and engages in commodities trading.

The Midstream, Marketing and Other segment comprises the following businesses:

• CO₂ Source Fields and Facilities – Oxy is the world's largest user of CO₂ injection for enhanced oil recovery (EOR), a technique used to increase production from mature wells. CO₂ is processed and transported for use in Oxy's EOR program. 
• Gas Processing Plants – Oxy's U.S. wet gas production and third-party production is processed through 15 gas plants, including 13 in the Permian Basin of southwest Texas and southeast New Mexico, to extract natural gas liquids from the wet gas stream.
• Marketing and Trading – These groups consist of Occidental Energy Marketing, Inc. (OEMI), which markets Oxy’s equity production and engages in third-party marketing and trading activities; and Phibro, which trades commodities and securities. 
• Pipelines – Oxy operates pipelines in the U.S. and holds interests in a pipeline in the Middle East. In the Permian Basin, Oxy owns Centurion Pipeline, an oil-gathering, common-carrier pipeline and storage system with approximately 2,700 miles of pipeline and storage capacity of 5.8 million barrels. In the Middle East, Oxy has a 24.5-percent equity interest in Dolphin Energy, the operator and owner of the Dolphin Pipeline, a 230-mile-long, 48-inch natural gas pipeline with the capacity to transport up to 3.2 billion cubic feet of natural gas per day. Oxy also owns interests in the General Partner of Plains All-American Pipeline, L.P.
• Power Generation – Oxy owns three cogeneration plants, two in Texas, one in Louisiana, and a gas-fired combined cycle power plant at Elk Hills, California. Collectively, the four plants have the capacity to produce approximately 1,800 megawatts of electricity per hour.