Impairments – Schedule of Pre-tax Loss (Gain) on Impairments and Divestitures (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill				$ 1,600
Loss (gain) on divestitures of long-lived assets	$ (11)		$ 3	(1,987)	$ 13
Pre-tax loss (gain) on divestitures and impairments, net				1,987	(13)
Natural Gas Pipelines
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill				1,000	0
Impairments of inventory				11	0
Loss (gain) on divestitures of long-lived assets				0	(10)
Products Pipelines
Finite-Lived Intangible Assets [Line Items]
Loss (gain) on impairments of long-lived assets				21	0
Terminals
Finite-Lived Intangible Assets [Line Items]
Loss (gain) on divestitures of long-lived assets				0	(3)
Loss (gain) on impairments of long-lived assets				5	0
CO2
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill				600	0
Loss (gain) on impairments of long-lived assets				350	0
Kinder Morgan Canada
Finite-Lived Intangible Assets [Line Items]
Loss (gain) on divestitures of long-lived assets					(2)
Corporate and intersegment eliminations
Finite-Lived Intangible Assets [Line Items]
Loss (gain) on divestitures of long-lived assets				0
Trans Mountain and Trans Mountain Expansion Project | Kinder Morgan Canada
Finite-Lived Intangible Assets [Line Items]
Loss (gain) on divestitures of long-lived assets				$ 0	$ 2
Oil and Gas Properties | CO2
Finite-Lived Intangible Assets [Line Items]
Loss (gain) on impairments of long-lived assets		$ 350