Goodwill Goodwill - Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 27, 2015
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0	$ 0	$ 1,150
Historical Goodwill			29,353
Accumulated impairment losses			(5,563)
Goodwill	22,162	22,152	23,790
Divestitures(a)	(3)	(1,644)
Currency translation	13	6
Natural Gas Pipelines Regulated
Goodwill [Line Items]
Historical Goodwill			17,527
Accumulated impairment losses			(1,643)
Goodwill	14,249	14,249	15,884
Divestitures(a)	0	(1,635)
Currency translation	0	0
Natural Gas Pipelines Non-Regulated
Goodwill [Line Items]
Goodwill, Impairment Loss			1,150
Historical Goodwill			5,812
Accumulated impairment losses			(1,597)
Goodwill	4,215	4,215	4,215
Divestitures(a)	0	0
Currency translation	0	0
CO2
Goodwill [Line Items]
Historical Goodwill			1,528
Accumulated impairment losses			0
Goodwill	1,528	1,528	1,528
Divestitures(a)	0	0
Currency translation	0	0
Products Pipelines
Goodwill [Line Items]
Historical Goodwill			2,125
Accumulated impairment losses			(1,197)
Goodwill	928	928	928
Divestitures(a)	0	0
Currency translation	0	0
Products Pipelines Terminals
Goodwill [Line Items]
Historical Goodwill			221
Accumulated impairment losses			(70)
Goodwill	151	151	151
Divestitures(a)	0	0
Currency translation	0	0
Terminals
Goodwill [Line Items]
Historical Goodwill			1,584
Accumulated impairment losses			(679)
Goodwill	893	896	905
Divestitures(a)	(3)	(9)
Currency translation	0	0
Kinder Morgan Canada
Goodwill [Line Items]
Historical Goodwill			556
Accumulated impairment losses			(377)
Goodwill	198	185	$ 179
Divestitures(a)	0	0
Currency translation	$ 13	$ 6
Vopak Terminal Assets [Member]
Goodwill [Line Items]
Goodwill				$ 6