Statement of Changes in Member's Equity (Unaudited) - Transco - USD ($) $ in Millions	Total	Transcontinental Gas Pipe Line Company, LLC [Member]	Member's Capital Transcontinental Gas Pipe Line Company, LLC [Member]	Retained Earnings Transcontinental Gas Pipe Line Company, LLC [Member]
Balance at beginning of period at Dec. 31, 2023			$ 5,088	$ 3,049
Net income	$ 1,033	$ 677		677
Cash distributions to parent		650		(650)
Balance at end of period at Jun. 30, 2024		8,164	5,088	3,076
Balance at beginning of period at Mar. 31, 2024			5,088	3,077
Net income	401	329		329
Cash distributions to parent				(330)
Balance at end of period at Jun. 30, 2024		8,164	5,088	3,076
Balance at beginning of period at Dec. 31, 2024		8,305	5,088	3,217
Net income	1,237	635		635
Cash distributions to parent		606		(606)
Balance at end of period at Jun. 30, 2025		8,334	5,088	3,246
Balance at beginning of period at Mar. 31, 2025			5,088	3,292
Net income	$ 546	314		314
Cash distributions to parent				(360)
Balance at end of period at Jun. 30, 2025		$ 8,334	$ 5,088	$ 3,246