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Reportable Segments - Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 3,572	$ 3,501	$ 7,414	$ 7,389
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(4)	(5)	(10)	(9)
Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenues	1,990	1,987	4,323	4,450
Natural Gas Pipelines | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(3)	(4)	(6)	(7)
Natural Gas Pipelines | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,993	1,991	4,329	4,457
Products Pipelines
Segment Reporting Information [Line Items]
Revenues	776	735	1,504	1,403
Products Pipelines | Operating Segments
Segment Reporting Information [Line Items]
Revenues	776	735	1,504	1,403
Terminals
Segment Reporting Information [Line Items]
Revenues	508	477	1,002	937
Terminals | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(1)	(1)	(3)	(2)
Terminals | Operating Segments
Segment Reporting Information [Line Items]
Revenues	509	478	1,005	939
CO2
Segment Reporting Information [Line Items]
Revenues	298	302	585	599
CO2 | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	(1)	0
CO2 | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 298	$ 302	$ 586	$ 599

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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