Reportable Segments Reportable Segments EBDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
DD&A	$ (539)	$ (578)	$ (1,636)	$ (1,750)
Amortization of excess cost of equity investments	(32)	(21)	(99)	(61)
General and administrative and corporate charges	(153)	(154)	(461)	(456)
Income Tax Expense	(140)	(151)	(304)	(471)
Net Income (Loss)	472	517	(443)	1,612
Operating Segments
Segment Reporting Information [Line Items]
Total Segment EBDA	1,716	1,876	3,282	5,731
Corporate and intersegment eliminations
Segment Reporting Information [Line Items]
DD&A	(539)	(578)	(1,636)	(1,750)
Amortization of excess cost of equity investments	(32)	(21)	(99)	(61)
General and administrative and corporate charges	(150)	(162)	(472)	(478)
Interest, net	(383)	(447)	(1,214)	(1,359)
Income Tax Expense	(140)	(151)	(304)	(471)
Natural Gas Pipelines | Operating Segments
Segment Reporting Information [Line Items]
Total Segment EBDA	1,091	1,092	2,284	3,383
Products Pipelines | Operating Segments
Segment Reporting Information [Line Items]
Total Segment EBDA	223	325	719	908
Terminals | Operating Segments
Segment Reporting Information [Line Items]
Total Segment EBDA	246	295	732	884
CO2 | Operating Segments
Segment Reporting Information [Line Items]
Total Segment EBDA	156	164	(453)	558
Kinder Morgan Canada | Operating Segments
Segment Reporting Information [Line Items]
Total Segment EBDA	$ 0	$ 0	$ 0	$ (2)