Reportable Segments Operating expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating expenses	$ 8,166	$ 12,351	$ 9,287
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Operating expenses	4,700	8,562	7,000
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
Operating expenses	2,024	2,391	1,239
Operating Segments | Terminals
Segment Reporting Information [Line Items]
Operating expenses	896	853	793
Operating Segments | CO2
Segment Reporting Information [Line Items]
Operating expenses	550	554	289
Other
Segment Reporting Information [Line Items]
Operating expenses	$ (4)	$ (9)	$ (34)