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Property, Plant, and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment [Text Block]
Note 9 – Property, Plant, and Equipment
The following tables present Property, plant, and equipment – net for the years ended:
Williams
Estimated
Useful Life  (1)
(Years)		Depreciation
Rates (1)
(%)		December 31,
20242023
   (Millions)
Nonregulated:
Natural gas gathering and processing facilities
5 - 40
$23,134 $21,357 
Construction in progressNot applicable1,543 1,138 
Oil and gas propertiesUnits of production1,685 1,111 
Other
0 - 45
4,798 3,268 
Regulated:
Natural gas transmission facilities
0 - 25
1.25 - 10.2
22,763 21,083 
Construction in progressNot applicableNot applicable542 1,124 
Other
5 - 45
0.00 - 33.33
2,930 2,761 
Total property, plant, and equipment, at cost57,395 51,842 
Accumulated depreciation and amortization(18,703)(17,531)
Property, plant, and equipment — net$38,692 $34,311 
Depreciation and amortization expense for Property, plant, and equipment – net was $1.8 billion, $1.7 billion, and $1.5 billion in 2024, 2023, and 2022, respectively.
Interest capitalized was $68 million, $54 million, and $20 million in 2024, 2023, and 2022, respectively.
Regulated Property, plant, and equipment – net includes approximately $354 million and $389 million at December 31, 2024 and 2023, respectively, related to the purchase price allocation of $1.5 billion to property, plant and equipment and adjustments to deferred taxes in excess of original cost from Williams’ purchase of Transco in 1995. This amount is being amortized over 40 years using the straight-line amortization method. Current FERC policy does not permit recovery through rates for amounts in excess of original cost of construction.
Transco
Depreciation
Rates (1)
(%)		December 31,
20242023
  (Millions)
Onshore transmission facilities
2.50 - 7.13
$17,242 $16,031 
Offshore transmission facilities
1.25
659 681 
Storage facilities
1.86 - 2.05
948 830 
Gathering facilities
0.00 - 1.00
136 158 
Construction in progress
Not applicable420 1,008 
Other
1.77 - 20.00
639 585 
Total property, plant, and equipment, at cost20,044 19,293 
Accumulated depreciation and amortization(5,941)(5,963)
Property, plant, and equipment — net$14,103 $13,330 
NWP
Depreciation
Rates (1)
(%)		December 31,
20242023
  (Millions)
Transmission facilities
2.70 - 10.20
$3,821 $3,570 
Storage facilities
1.60 - 2.76
160 155 
Construction in progress
Not applicable66 85 
Other
0.00 - 33.33
171 165 
Total property, plant, and equipment, at cost4,218 3,975 
Accumulated depreciation and amortization(2,089)(2,026)
Property, plant, and equipment — net$2,129 $1,949 
__________
(1)    Estimated useful life and depreciation rates are presented as of December 31, 2024. Depreciation rates and estimated useful lives for regulated assets are prescribed by the FERC.
Asset Retirement Obligations
Williams’ accrued obligations primarily relate to offshore platforms and pipelines, oil and gas properties, gas transmission pipelines and facilities, underground storage caverns, gas processing, fractionation, and compression facilities, and gas gathering well connections and pipelines. At the end of the useful life of each respective asset, Williams is legally obligated to dismantle offshore platforms and appropriately abandon offshore pipelines, to remove certain components of gas transmission facilities from the ground, to restore land and remove surface equipment at gas processing, fractionation, and compression facilities, to cap certain gathering pipelines at the wellhead connection and remove any related surface equipment, to plug storage caverns and remove any related surface equipment, and to plug producing wells and remove any related surface equipment.
The following tables present the significant changes to AROs, of which $2.548 billion and $1.978 billion are included in Regulatory liabilities, deferred income, and other with the remaining current portion in Other current liabilities at December 31, 2024 and 2023, respectively.
Williams
 Year Ended December 31,
 20242023
 (Millions)
Balance at beginning of year$2,084 $1,914 
Liabilities incurred (1)
474 42 
Liabilities settled(68)(43)
Accretion118 97 
Revisions (2)
31 74 
Balance at end of year$2,639 $2,084 
___________
(1)Includes $250 million, $106 million, and $114 million of ARO in 2024 related to the Discovery, Gulf Coast Storage, and Crowheart Acquisitions, respectively.
(2)Several factors are considered in the annual review process, including inflation rates, current estimates for removal cost, market risk premiums, discount rates, and the estimated remaining useful life of the assets.
Transco
 Year Ended December 31,
 20242023
 (Millions)
Balance at beginning of year$619 $563 
Liabilities incurred
— 8 
Liabilities settled
(32)(23)
Accretion
29 31 
Revisions (1)
(1)40 
Balance at end of year$615 $619 
___________
(1)Changes in estimates of existing obligations are primarily due to the annual review process, which considers various factors including inflation rate, current estimates for removal costs, discount rates, and the estimated remaining life of assets.
The funds Transco collects through a portion of its rates to fund its AROs are deposited into an external trust account dedicated to funding its AROs (ARO Trust). (See Note 16 – Fair Value Measurements, Guarantees, and Concentration of Credit Risk.)
NWP
 Year Ended December 31,
 20242023
 (Millions)
Balance at beginning of year$136 $129 
Accretion
8 7 
Balance at end of year$144 $136 

NWP’s gross regulatory asset balances associated with ARO as of December 31, 2024 and 2023 were $124 million and $116 million, respectively. NWP’s regulatory asset is expected to be fully recovered through the negative salvage component of depreciation included in NWP’s rates; as such, the negative salvage component of accumulated depreciation collected through rates and reflected as a regulatory liability has been netted with the ARO regulatory asset to result in a regulatory liability of $30 million and $31 million at December 31, 2024 and 2023, respectively (See Note 10 – Regulatory Assets and Liabilities).