This is not as easy as some of the other Integrated oil company splits. Marathon was pretty easy and even though the Conoco/Phillips had a lot of other businesses besides refining, they first took all those units (CPChem, Midstream, marketing &refining and the Spectra JV) and dumped them into Phillips 66. Then they let each company reorganize. Some non core E&P sales were done prior to the split, but they are still continuing to restructure the E&P post split.
OXY is trying to sell property but has never split off the chemicals and/or midstream. I feel that this will be slow trucking, hence not giving the plan the kind of jolt that would move the stock more than the 15 points it has gained.