Net plant and equipment consisted of the following at December 31, 2025 and 2024:
In millions20252024
Land$199 $188 
Buildings and improvements1,705 1,562 
Machinery and equipment4,389 4,043 
Construction in progress299 270 
Gross plant and equipment6,592 6,063 
Accumulated depreciation(4,362)(4,027)
Net plant and equipment$2,230 $2,036 
The ranges of useful lives used to depreciate plant and equipment are as follows:
Buildings and improvements
5—50 years
Machinery and equipment
3—12 years

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.