Impairments Goodwill Impairments (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Goodwill, Balance		$ 21,451		$ 21,451	$ 21,451
Impairment					(1,600)
Goodwill, Balance	$ 19,851				19,851
Loss (gain) on divestitures of long-lived assets	(11)		$ 3		(1,987)	$ 13
Regulated
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Goodwill, Balance		14,249		14,249	14,249
Impairment					0
Goodwill, Balance	14,249				14,249
Natural Gas Pipelines Non-Regulated
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Goodwill, Balance		3,343		3,343	3,343
Impairment				(1,000)	(1,000)
Goodwill, Balance	2,343				2,343
CO2
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Goodwill, Balance		1,528		1,528	1,528
Impairment		(600)			(600)
Goodwill, Balance	$ 928				$ 928
CO2 | Maximum
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	10.00%				10.00%
Products Pipelines Terminals
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Goodwill, Balance		151		151	$ 151
Impairment					0
Goodwill, Balance	$ 151				151
Terminals
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Goodwill, Balance		802		802	802
Impairment					0
Goodwill, Balance	$ 802				$ 802
Terminals | Maximum
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	10.00%				10.00%
Products Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Goodwill, Balance		$ 1,378		$ 1,378	$ 1,378
Impairment					0
Goodwill, Balance	$ 1,378				$ 1,378
Products Pipelines | Maximum
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	10.00%				10.00%
CO2
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Impairment					$ (600)	0
Terminals
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss (gain) on divestitures of long-lived assets					0	(3)
Kinder Morgan Canada
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss (gain) on divestitures of long-lived assets						(2)
Kinder Morgan Canada | Trans Mountain and Trans Mountain Expansion Project
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss (gain) on divestitures of long-lived assets					$ 0	$ 2
Valuation Technique, Discounted Cash Flow | Natural Gas Pipelines Non-Regulated
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Number of Years of Projection to Determine Fair Value					6 years 6 months
Estimated Weighted Average Cost Of Capital	8.00%				8.00%
Valuation Technique, Discounted Cash Flow | CO2
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Estimated Weighted Average Cost Of Capital		9.25%
Valuation Technique, Discounted Cash Flow | Oil and Gas Properties | CO2
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Estimated Weighted Average Cost Of Capital		10.50%
Valuation, Market Approach | Natural Gas Pipelines Non-Regulated
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Fair Value Measurement Inputs and Valuation Techniques, Weighting Of Approach	0.25				0.25
Enterprise Value to EBITDA Multiple Valuation	10				10
Valuation, Income Approach | Natural Gas Pipelines Non-Regulated
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Fair Value Measurement Inputs and Valuation Techniques, Weighting Of Approach	0.75				0.75
Weighted Market Approach and Income Approach | Natural Gas Pipelines Non-Regulated
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Enterprise Value to EBITDA Multiple Valuation	11				11