Phillips 66 on Friday reported its profit dropped 43% in the final quarter of the year as low commodity prices dragged on the energy giant’s results. For the latest quarter, the refining segment’s earnings fell 21% to $410 million. In the chemicals segment, earnings declined 21% to $212 million. In marketing and specialties, earnings dropped 37% to $231 million. The midstream segment swung to a loss of $77 million compared with a…