Significant classes of property, plant and equipment are as follows:
(Millions of dollars)
December 31,
Depreciable Lives (Yrs)20252024
Production plants (primarily 15-year life) (a)
10-20
$40,301 $35,364 
Storage tanks
15-20
6,215 5,689 
Transportation equipment and other
3-15
4,872 4,210 
Cylinders
10-30
5,542 4,970 
Buildings
25-40
3,831 3,355 
Land and improvements (b)
0-20
1,188 1,045 
Construction in progress6,130 4,086 
68,079 58,719 
Less: accumulated depreciation(39,819)(33,944)
$28,260 $24,775 
(a)     Depreciable lives of production plants related to long-term customer supply contracts are generally consistent with the contract lives.
(b)     Land is not depreciated.

Historical Timeline

Fiscal YearFiled
2025Feb 25, 2026Showing above
2024Feb 26, 2025
2023Feb 28, 2024
2022Feb 28, 2023
2021Feb 28, 2022
2020Mar 1, 2021
2019Mar 2, 2020
2018Mar 18, 2019

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.