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Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	May 31, 2023	Dec. 31, 2021	Aug. 20, 2021
Goodwill [Line Items]
Gross goodwill	$ 26,907			$ 26,700
Accumulated impairment losses	(6,786)			(6,786)
Goodwill	20,121	$ 19,965		19,914
Acquisitions	156	51
Kinetrex Energy
Goodwill [Line Items]
Goodwill					$ 53
Natural Gas Pipelines Regulated
Goodwill [Line Items]
Gross goodwill	15,892			15,892
Accumulated impairment losses	(1,643)			(1,643)
Goodwill	14,249	14,249		14,249
Acquisitions	0	0
Natural Gas Pipelines Non-Regulated
Goodwill [Line Items]
Gross goodwill	5,096			4,940
Accumulated impairment losses	(2,597)			(2,597)
Goodwill	2,499	2,343		2,343
Acquisitions	156	0
CO2
Goodwill [Line Items]
Gross goodwill	1,528			1,528
Accumulated impairment losses	(600)			(600)
Goodwill	928	928		928
Acquisitions	0	0
Products Pipelines
Goodwill [Line Items]
Gross goodwill	2,575			2,575
Accumulated impairment losses	(1,197)			(1,197)
Goodwill	1,378	1,378		1,378
Acquisitions	0	0
Products Pipelines Terminals
Goodwill [Line Items]
Gross goodwill	221			221
Accumulated impairment losses	(70)			(70)
Goodwill	151	151		151
Acquisitions	0	0
Terminals
Goodwill [Line Items]
Gross goodwill	1,481			1,481
Accumulated impairment losses	(679)			(679)
Goodwill	802	802		802
Acquisitions	0	0
Terminals \| Maximum
Goodwill [Line Items]
Fair value in excess of their respective carrying values (percentage)			10.00%
Energy Transition Ventures
Goodwill [Line Items]
Gross goodwill	114			63
Accumulated impairment losses	0			0
Goodwill	114	114		$ 63
Acquisitions	$ 0	51
Energy Transition Ventures \| Kinetrex Energy
Goodwill [Line Items]
Goodwill purchase price adjustment		$ (10)