We compute depreciation expense on a straight-line basis over the estimated useful lives of the assets as follows:
ClassificationEstimated Useful Life
Buildings and leasehold improvements
Term of lease to 39 years
Vehicles, tractors and trailers
3 to 14 years
Machinery and equipment
3 to 10 years
Computer software and equipment
1.5 to 7 years
The following table summarizes our property and equipment:
December 31,
(In millions)20252024
Property and equipment
Buildings and leasehold improvements$57 $45 
Vehicles, tractors and trailers23 25 
Machinery and equipment47 44 
Computer software and equipment388 338 
Total property and equipment, gross515 452 
Less: accumulated depreciation(381)(317)
Total property and equipment, net$134 $135 
Net book value of capitalized internally-developed software included in property and equipment, net$63 $67 

Historical Timeline

Fiscal YearFiled
2025Feb 9, 2026Showing above
2024Feb 27, 2025
2023Feb 13, 2024
2022Feb 24, 2023

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.