Transactions with Affiliates Related Party Transations (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Jul. 31, 2024 USD ($)	Jun. 30, 2024 USD ($) employee	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) employee	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Related party transaction, rate	5.10%
Interest income			$ 15,416	$ 22,851	$ 32,969	$ 43,387
Revenues			710,489	727,783	1,442,209	1,433,678
Cost of natural gas sales			$ 21,550	55,899	$ 45,897	77,671
Entity number of employees | employee			0		0
Reduction to operating expenses			$ 3,300	4,200	$ 5,600	7,000
Cash distributions to parent					650,000	620,000
Williams Companies Inc
Related Party Transaction [Line Items]
Cost of natural gas sales						4,300
Credit Agreement
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			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
Related Party [Member]
Related Party Transaction [Line Items]
Advances to affiliate			1,026,681		1,026,681		$ 1,352,927
Williams Companies Inc
Related Party Transaction [Line Items]
Advances to affiliate			1,000,000		1,000,000		$ 1,400,000
Interest income			14,100	21,200	30,100	40,500
Revenues				13,800		26,000
Cost of natural gas sales				900
Expenses, related party			75,600	$ 76,400	$ 160,100	160,500
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Revenues			18,700			37,300
Cost of natural gas sales			$ 900			$ 2,900
Subsequent Event
Related Party Transaction [Line Items]
Cash distributions to parent		$ 180,000