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Divestitures - Sale of U.S. Portion of Cochin Pipeline System and KML (Details) $ in Millions			12 Months Ended
	Jan. 09, 2020 USD ($)	Dec. 16, 2019 USD ($) transactions shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 03, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of transactions closed on | transactions		2
Loss (gain) on divestitures and impairments, net			$ 1,932	$ (942)	$ 167
Marketable securities at fair value			$ 0	925
Proceeds from sale of marketable securities	$ 907
Proceeds from sale of marketable securities, after taxes	$ 764
KML and U.S. Portion of Cochin Pipeline System
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss (gain) on divestitures and impairments, net				$ (1,296)
U.S. Portion of Cochin Pipeline
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration		$ 1,553
Kinder Morgan Canada Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration		$ 892
Shares of acquirer received, per share of subsidiary held | shares		0.3068
Aggregate number of shares received | shares		25,000,000
Kinder Morgan Canada Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage		70.00%				70.00%

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