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	$ 632	$ 348		348
Cash distributions to parent		320		(320)
Balance at end of period at Mar. 31, 2024		8,165	5,088	3,077
Balance at beginning of period at Dec. 31, 2024		8,305	5,088	3,217
Net income	$ 691	321		321
Cash distributions to parent		246		(246)
Balance at end of period at Mar. 31, 2025		$ 8,380	$ 5,088	$ 3,292