Impairments (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) loss on divestitures and impairments of equity investments and long-lived assets		$ (285.0)	$ 437.0	$ 172.0
Equity Method Investments		7,759.0	7,481.0
(Gain) Loss on Sale of Assets and Asset Impairment Charges		(942.0)	167.0	13.0
Revenues		13,209.0	14,144.0	13,705.0
Impairment losses		1,014.0
KML and U.S. Portion of Cochin Pipeline
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges		(1,296.0)
Trans Mountain and Trans Mountain Expansion Project
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges			(595.0)
Natural Gas Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets	$ 600.0	290.0	636.0	30.0
(Gain) Loss on Sale of Assets and Asset Impairment Charges		(967.0)	(6.0)	0.0
Loss (Gain) on impairments and divestitures of equity investments, net		650.0	270.0	150.0
Revenues		8,128.0	8,807.0	8,502.0
Natural Gas Pipelines | Investee [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Impairment at equity investee, other than temporary		0.0	0.0	10.0
Natural Gas Pipelines | KML and U.S. Portion of Cochin Pipeline
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges		(957.0)
Products Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Revenues		1,831.0	1,887.0	1,744.0
Terminals
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets		0.0	59.0	3.0
(Gain) Loss on Sale of Assets and Asset Impairment Charges		(335.0)	(6.0)	(18.0)
Revenues		2,031.0	2,025.0	1,972.0
Terminals | Kinder Morgan Canada Limited
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges		(339.0)
Terminals | Deeprock Development [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges				$ (23.0)
Disposal Group, Equity Interest Sold				40.00%
CO2
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets		74.0	79.0	$ (1.0)
(Gain) Loss on Sale of Assets and Asset Impairment Charges		2.0	0.0	0.0
Revenues		1,219.0	1,255.0	1,196.0
CO2 | Investee [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Impairment at equity investee, other than temporary		0.0	0.0	(4.0)
Kinder Morgan Canada
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges				0.0
Revenues		0.0	170.0	256.0
Kinder Morgan Canada | Trans Mountain and Trans Mountain Expansion Project
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges		2.0	(595.0)
Other
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges		(1.0)	0.0	2.0
Operating Segments | Natural Gas Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Revenues		8,170.0	8,855.0
Operating Segments | Products Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Revenues		1,831.0	1,887.0
Operating Segments | Terminals
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Revenues		2,034.0	2,027.0
Operating Segments | CO2
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Revenues		1,219.0	1,255.0
Operating Segments | Kinder Morgan Canada
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Revenues			170.0
Cost of Sales | Natural Gas Pipelines | Colden storage [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss on impairment of long-lived assets				$ 3.0
Other, Net | Terminals | Equity Method Investments [Member]
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
(Gain) Loss on Sale of Assets and Asset Impairment Charges		7.0
MEP
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Equity Method Investments		439.0	235.0
Ruby
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Equity Method Investments		41.0	$ 750.0
Loss (Gain) on impairments and divestitures of equity investments, net		650.0
Ruby | Natural Gas Pipelines
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]
Loss (Gain) on impairments and divestitures of equity investments, net		$ 650.0