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Reportable Segments Operating expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating expenses(a)	$ 5,398	$ 6,280	$ 7,288
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Operating expenses(a)	3,457	4,213	5,218
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
Operating expenses(a)	779	684	748
Operating Segments | Terminals
Segment Reporting Information [Line Items]
Operating expenses(a)	762	888	823
Operating Segments | CO2
Segment Reporting Information [Line Items]
Operating expenses(a)	404	496	453
Operating Segments | Kinder Morgan Canada
Segment Reporting Information [Line Items]
Operating expenses(a)	0	0	72
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating expenses(a)	$ (4)	$ (1)	$ (26)

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Cost of Goods Sold, Operations and Maintenance Expense and Taxes Other Than Income Taxes

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