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Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	May 31, 2024	Dec. 31, 2022
Goodwill [Line Items]
Gross goodwill	$ 26,870			$ 26,751
Accumulated impairment losses	(6,786)			(6,786)
Goodwill	20,084	$ 20,121		19,965
Acquisition of STX Midstream		156
Acquisition	(28)
Divestitures	(9)
Natural Gas Pipelines
Goodwill [Line Items]
Gross goodwill	20,960			20,832
Accumulated impairment losses	(4,240)			(4,240)
Goodwill	16,720	16,748		16,592
Acquisition of STX Midstream		156
Acquisition	(28)
Divestitures	0
Products Pipelines
Goodwill [Line Items]
Gross goodwill	2,796			2,796
Accumulated impairment losses	(1,267)			(1,267)
Goodwill	1,529	1,529		1,529
Acquisition of STX Midstream		0
Acquisition	0
Divestitures	0
Terminals
Goodwill [Line Items]
Gross goodwill	1,481			1,481
Accumulated impairment losses	(679)			(679)
Goodwill	802	802		802
Acquisition of STX Midstream		0
Acquisition	0
Divestitures	0
CO2
Goodwill [Line Items]
Gross goodwill	1,633			1,642
Accumulated impairment losses	(600)			(600)
Goodwill	1,033	1,042		$ 1,042
Acquisition of STX Midstream		$ 0
Acquisition	0
Divestitures	(9)
ETV
Goodwill [Line Items]
Goodwill	$ 114
Minimum \| Natural Gas Pipelines - Nonregulated
Goodwill [Line Items]
Fair value in excess of their respective carrying values (percentage)			10.00%
Minimum \| Natural Gas Pipelines - Regulated
Goodwill [Line Items]
Fair value in excess of their respective carrying values (percentage)			10.00%
Minimum \| Products Pipelines
Goodwill [Line Items]
Fair value in excess of their respective carrying values (percentage)			10.00%
Minimum \| Products Pipelines, Terminals
Goodwill [Line Items]
Fair value in excess of their respective carrying values (percentage)			10.00%
Minimum \| Terminals
Goodwill [Line Items]
Fair value in excess of their respective carrying values (percentage)			10.00%
Minimum \| CO2, Excluding ETV
Goodwill [Line Items]
Fair value in excess of their respective carrying values (percentage)			10.00%
Minimum \| ETV
Goodwill [Line Items]
Fair value in excess of their respective carrying values (percentage)			10.00%