Occidental Petroleum Corporation revenue for the last year amounted to 26.73 B USD, the most of which — 21.70 B USD — came from its highest performing source at the moment, Oil and Gas, the year earlier bringing 21.28 B USD. The greatest contribution to the revenue figure was made by United States — last year it brought Occidental Petroleum Corporation 23.88 B USD, and the year before that — 24.74 B USD.