Reportable Segments Segment earnings before depreciation, depletion, amortization and amortization of excess cost of equity investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
DD&A	$ (2,135)	$ (2,164)	$ (2,411)
Amortization of excess cost of equity investments	(78)	(140)	(83)
General and administrative and corporate charges	(655)	(648)	(590)
Interest, net	(1,492)	(1,595)	(1,801)
Income tax expense	(369)	(481)	(926)
Net Income	1,850	180	2,239
Total Segments EBDA(e)
Segment Reporting Information [Line Items]
Segment EBDA(c)	6,547	5,213	8,071
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Segment EBDA(c)	3,815	3,483	4,661
DD&A	(1,099)	(1,062)	(1,005)
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
Segment EBDA(c)	1,064	977	1,225
DD&A	(335)	(347)	(338)
Operating Segments | Terminals
Segment Reporting Information [Line Items]
Segment EBDA(c)	908	1,045	1,506
DD&A	(440)	(438)	(494)
Operating Segments | CO2
Segment Reporting Information [Line Items]
Segment EBDA(c)	760	(292)	681
DD&A	(236)	(291)	(548)
Operating Segments | Kinder Morgan Canada
Segment Reporting Information [Line Items]
Segment EBDA(c)	0	0	(2)
Other
Segment Reporting Information [Line Items]
DD&A	(25)	(26)	(26)
General and administrative and corporate charges	$ (623)	$ (653)	$ (611)