Transactions with Affiliates Related Party Transations (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) employee	Jul. 31, 2023 USD ($)	Jun. 30, 2023 USD ($) employee	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) employee	Jun. 30, 2022 USD ($)	Oct. 08, 2026 USD ($)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Related party transaction, rate	4.90%
Interest income			$ 22,851	$ 4,542	$ 43,387	$ 5,644
Revenues			727,783	709,724	1,433,678	1,396,192
Cost of natural gas sales			$ 55,899	43,371	$ 77,671	59,016
Entity number of employees | employee	0		0		0
Reduction to operating expenses			$ 4,200	2,100	$ 7,000	3,700
Cash distributions to parent					620,000	307,548
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 | Williams Companies Inc
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	1,739,507		1,739,507		1,739,507			$ 1,813,480
Revenues			13,800	22,600	26,000	43,700
Cost of natural gas sales			900	1,800	4,300	7,200
Williams Companies Inc | Related Party [Member]
Related Party Transaction [Line Items]
Advances to affiliate	$ 1,700,000		1,700,000		1,700,000			$ 1,800,000
Interest income			21,200	3,300	40,500	3,500
Expenses, related party			$ 76,400	$ 87,400	$ 160,500	$ 167,000
Subsequent Event
Related Party Transaction [Line Items]
Cash distributions to parent		$ 300,000