Transactions with Affiliates Related Party Transations (Details) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) employee	Oct. 31, 2023 USD ($)	Sep. 30, 2023 USD ($) employee	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) employee	Sep. 30, 2022 USD ($)	Oct. 08, 2026 USD ($)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Related party transaction, rate	5.20%
Interest income			$ 22,827	$ 12,070	$ 66,214	$ 17,714
Revenues			715,566	771,580	2,149,244	2,167,772
Cost of natural gas sales			$ 34,676	80,678	$ 112,347	139,694
Entity number of employees | employee	0		0		0
Reduction to operating expenses			$ 3,500	2,900	$ 10,500	6,600
Cash distributions to parent					920,000	587,548
Credit Agreement
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 500,000		500,000		500,000
Credit Agreement | Williams Companies Inc
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,750,000		3,750,000		3,750,000
Forecast | Credit Agreement
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 194,000
Related Party [Member]
Related Party Transaction [Line Items]
Advances to affiliate	1,564,365		1,564,365		1,564,365			$ 1,813,480
Williams Companies Inc
Related Party Transaction [Line Items]
Advances to affiliate	$ 1,600,000		1,600,000		1,600,000			$ 1,800,000
Interest income			21,300	10,900	61,800	14,400
Expenses, related party			77,200	88,900	237,700	255,900
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Revenues			12,200	25,100	38,200	68,800
Cost of natural gas sales			$ 1,300	$ 7,200	$ 5,600	$ 14,400
Subsequent Event
Related Party Transaction [Line Items]
Cash distributions to parent		$ 300,000