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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2025
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
Transco and NWP are participants in Williams’ cash management program, and thus make advances to and receive advances from Williams. Advances to Williams are represented by demand notes and are classified as Trade accounts and other receivables - Advances to affiliate in the Balance Sheet. Advances from Williams are classified as Payables - Advances from affiliate. Advances are stated at the historical carrying amounts.
June 30,December 31,
20252024
(Millions)
Advances to affiliate
Transco$555 $638 
NWP64 — 
Advances from affiliate
NWP$— $26 
Interest expense and income are recognized when earned and the collectability is reasonably assured. The interest rate on intercompany demand notes is based upon the daily overnight investment rate paid on Williams’ excess cash at the end of each month, which was approximately 4 percent at June 30, 2025. Interest income is included in Interest income in the Statement of Net Income for Transco and Other income (expense) – net in the Statement of Net Income for NWP.
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
(Millions)
Net interest income from advances
Transco$6 $14 $12 $30 
NWP1 2 1 4 
Revenues received from affiliates are included in Transco’s Total revenues in the Statement of Net Income. Costs of gas purchased from affiliates are included in Transco’s Natural gas product costs in the Statement of Net Income. All gas purchases are made at market or contracted prices.



Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
(Millions)
Transco affiliate activity
Total revenues$22 $18 $42 $37 
Natural gas product costs3 1 5 3 
Services necessary to operate Transco and NWP are provided by Williams and certain affiliates of Williams. Transco and NWP reimburse Williams and its affiliates for all direct and indirect expenses incurred or payments made (including salary, bonus, incentive compensation, and benefits) in connection with these services. Employees of Williams also provide general, administrative, and management services, and Transco and NWP are charged for certain administrative expenses incurred by Williams. These charges are either directly assigned or allocated. Allocated charges are specific or general. Specific allocations are based on a relationship with the delivery of services and general allocations are based on a three-factor formula, which considers revenues; property, plant, and equipment; and payroll. In management’s estimation, the allocation methodologies used are reasonable and result in
a reasonable allocation of costs of doing business incurred by Williams. Transco and NWP have recorded for these service expenses, which are primarily included in Operating and maintenance expenses and Selling, general, and administrative expenses in the Statement of Net Income.

Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
(Millions)
Services from affiliates
Transco$82 $75 $174 $160 
NWP21 21 45 43