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Reportable Segments Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 11,700	$ 13,209	$ 14,144
Other
Segment Reporting Information [Line Items]
Revenues	(40)	(45)	(50)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(40)	(45)	(50)
Natural Gas Pipelines
Segment Reporting Information [Line Items]
Revenues	7,222	8,128	8,807
Natural Gas Pipelines | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(37)	(42)	(48)
Products Pipelines
Segment Reporting Information [Line Items]
Revenues	1,721	1,831	1,887
Terminals
Segment Reporting Information [Line Items]
Revenues	1,719	2,031	2,025
Terminals | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(3)	(3)	(2)
CO2
Segment Reporting Information [Line Items]
Revenues	1,038	1,219	1,255
Kinder Morgan Canada
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 170
Revenues from External Customers [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	10.00%	10.00%	10.00%
Single customer exceeding 10% of total [Member]
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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