The following tables present Property, plant, and equipment – net for the years ended:
Williams
Estimated
Useful Life  (1)
(Years)
Depreciation
Rates (1)
(%)
December 31,
20252024
   (Millions)
Nonregulated:
Natural gas gathering and processing facilities
5 - 40
$24,782 $23,134 
Construction in progressNot applicable2,947 1,543 
Oil and gas propertiesUnits of production1,552 1,685 
Other
0 - 45
5,177 4,798 
Regulated:
Natural gas transmission facilities
2.23 - 10.20
23,886 22,763 
Construction in progressNot applicableNot applicable657 542 
Other
5 - 45
0.00 - 33.33
3,009 2,930 
Total property, plant, and equipment, at cost62,010 57,395 
Accumulated depreciation and amortization(20,014)(18,703)
Property, plant, and equipment — net$41,996 $38,692 
Transco
Depreciation
Rates (1)
(%)
December 31,
20252024
  (Millions)
Onshore transmission facilities
2.29 - 6.67
$18,093 $17,242 
Offshore transmission facilities
2.23
633 659 
Storage facilities
2.27 - 2.31
1,010 948 
Gathering facilities
0.00 - 0.94
105 136 
Construction in progress
Not applicable526 420 
Other
1.58 - 20.00
645 639 
Total property, plant, and equipment, at cost21,012 20,044 
Accumulated depreciation and amortization(6,404)(5,941)
Property, plant, and equipment — net$14,608 $14,103 
NWP
Depreciation
Rates (1)
(%)
December 31,
20252024
  (Millions)
Transmission facilities
2.70 - 10.20
$3,987 $3,821 
Storage facilities
1.60 - 2.76
165 160 
Construction in progress
Not applicable111 66 
Other
0.00 - 33.33
171 171 
Total property, plant, and equipment, at cost4,434 4,218 
Accumulated depreciation and amortization(2,164)(2,089)
Property, plant, and equipment — net$2,270 $2,129 
__________
(1)    Estimated useful life and depreciation rates are presented as of December 31, 2025. Depreciation rates and estimated useful lives for regulated assets are prescribed by the FERC.

Historical Timeline

Fiscal YearFiled
2025Feb 24, 2026Showing above
2024Feb 25, 2025
2023Feb 21, 2024
2022Feb 27, 2023
2021Feb 28, 2022
2020Feb 24, 2021
2019Feb 24, 2020
2018Feb 21, 2019
2017Feb 22, 2018
2016Feb 22, 2017
2015Feb 26, 2016

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.