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Divestitures and Acquisition Sale of Trans Mountain pipeline System and ts Expansion Project (Details) $ in Millions, $ in Millions					3 Months Ended	12 Months Ended
	Feb. 01, 2019 USD ($)	Jan. 04, 2019	Jan. 03, 2019 USD ($)	Jan. 03, 2019 CAD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Aug. 31, 2018 USD ($)	Aug. 31, 2018 CAD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairments and divestitures, net						$ 167	$ 13	$ 387
Proceeds from the TMPL Sale, net of cash disposed (Note 3)						2,998	0	0
Repayments of debt						14,591	$ 11,064	$ 10,060
Trans Mountain and Trans Mountain Expansion Project [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration									$ 3,400	$ 4,430
Contractual purchase price										$ 4,500
Loss on impairments and divestitures, net						(596)
Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to noncontrolling interests			$ 900	$ 1,200
Repayments of commercial paper			400
Kinder Morgan, Inc. | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from the TMPL Sale, net of cash disposed (Note 3)			$ 1,900	$ 2,500
Repayments of debt	$ 1,300
Kinder Morgan Canada Limited [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Approved reduction in stated capital					$ 1,450
Kinder Morgan Canada Limited [Member] | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage			70.00%	70.00%
Reverse stock split ratio		0.33
Working Capital Adjustments [Member] | Trans Mountain and Trans Mountain Expansion Project [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairments and divestitures, net						$ 26

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