Transactions with Affiliates Related Party Transations (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Sep. 30, 2023	Apr. 30, 2024 USD ($)	Mar. 31, 2024 USD ($) employee	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Related party transaction, rate	5.20%
Interest income			$ 17,553	$ 20,536
Revenues			731,720	705,895
Cost of natural gas sales			$ 24,347	21,772
Entity number of employees | employee			0
Reduction to operating expenses			$ 2,300	2,800
Cash distributions to parent			320,000	310,000
Credit Agreement
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			500,000
Credit Agreement | Williams Companies Inc
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			3,750,000
Related Party [Member]
Related Party Transaction [Line Items]
Advances to affiliate			1,180,594		$ 1,352,927
Williams Companies Inc
Related Party Transaction [Line Items]
Advances to affiliate			1,200,000		$ 1,400,000
Interest income			16,000	19,300
Expenses, related party			84,500	84,100
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Revenues			18,600	12,200
Cost of natural gas sales			$ 2,000	$ 3,400
Subsequent Event
Related Party Transaction [Line Items]
Cash distributions to parent		$ 330,000