The company’s investment in PP&E, with the associated accumulated depreciation and amortization (Accum. D&A), at December 31 was:
 
 Millions of Dollars
 20252024
 Gross
PP&E
Accum.
D&A
Net
PP&E
Gross
PP&E
Accum.
D&A
Net
PP&E
Midstream$29,558 5,771 23,787 26,187 4,820 21,367 
Chemicals   — — — 
Refining25,955 13,685 12,270 22,274 11,991 10,283 
Marketing and Specialties1,014 543 471 2,091 1,267 824 
Renewable Fuels3,772 1,762 2,010 3,716 1,669 2,047 
Corporate and Other1,492 933 559 1,688 945 743 
$61,791 22,694 39,097 55,956 20,692 35,264 

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.