Occidental Petroleum Corporation revenue for the last year amounted to 28.26 B USD, the most of which — 21.28 B USD — came from its highest performing source at the moment, Oil and Gas, the year earlier bringing 27.16 B USD. The greatest contribution to the revenue figure was made by United States — last year it brought Occidental Petroleum Corporation 24.74 B USD, and the year before that — 32.02 B USD.