Segment Disclosures and Related Information Our operating segments are: 1) Midstream Provides crude oil and refined products transportation, terminaling and processing services, as well as natural gas, NGL and liquefied petroleum gas (LPG) transportation, storage, processing and marketing services, mainly in the United States. The Midstream segment includes our master limited partnership, Phillips 66 Partners, as well as our 50 percent equity investment in DCP Midstream. 2) Chemicals Consists of our 50 percent equity investment in CPChem, which manufactures and markets petrochemicals and plastics on a worldwide basis. 3) Refining Refines crude oil and other feedstocks into petroleum products (such as gasoline, distillates and aviation fuels) at 13 refineries in the United States and Europe. 4) Marketing and Specialties Purchases for resale and markets refined petroleum products, mainly in the United States and Europe. In addition, this segment includes the manufacturing and marketing of specialty products, as well as power generation operations. Corporate and Other includes general corporate overhead, interest expense, our investments in new technologies and various other corporate activities. Corporate assets include all cash and cash equivalents. During the fourth quarter of 2017, the segment performance measure used by our chief executive officer to assess performance and allocate resources was changed from net income attributable to Phillips 66 to net income. This change reflects the recognition that management does not differentiate between those earnings attributable to Phillips 66 and those attributable to noncontrolling interests when making operating and resource allocation decisions impacting segment performance. Prior period segment information has been recast to conform to the current presentation. Intersegment sales are at prices that we believe approximate market. Analysis of Results by Operating Segment Millions of Dollars Three Months Ended March 31 2018 2017 Sales and Other Operating Reve