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Reportable Segments Investments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Investments	$ 7,298	$ 7,027
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Investments	6,218	6,185
Operating Segments | CO2
Segment Reporting Information [Line Items]
Investments	6	0
Operating Segments | Terminals
Segment Reporting Information [Line Items]
Investments	263	252
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
Investments	777	566
Operating Segments | Kinder Morgan Canada
Segment Reporting Information [Line Items]
Investments	34	20
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Investments	$ 0	$ 4

X

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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+ References

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