Statement of Changes in Member's Equity - 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 year at Dec. 31, 2021			$ 4,960	$ 2,760
Cash contributions from parent		$ (128)	128
Net income	$ 2,049	1,100		1,100
Cash distributions to parent		838		(838)
Balance at end of year at Dec. 31, 2022		8,110	5,088	3,022
Cash contributions from parent		0	0
Net income	3,179	1,247		1,247
Cash distributions to parent		1,220		(1,220)
Balance at end of year at Dec. 31, 2023		8,137	5,088	3,049
Cash contributions from parent		0	0
Net income	$ 2,225	1,313		1,313
Cash distributions to parent		1,145		(1,145)
Balance at end of year at Dec. 31, 2024		$ 8,305	$ 5,088	$ 3,217