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Reportable Segments Capital expenditures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Capital expenditures	$ 3,188	$ 2,882	$ 3,896
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Capital expenditures	1,376	1,227	1,642
Operating Segments | CO2
Segment Reporting Information [Line Items]
Capital expenditures	436	276	725
Operating Segments | Terminals
Segment Reporting Information [Line Items]
Capital expenditures	888	983	847
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
Capital expenditures	127	244	524
Operating Segments | Kinder Morgan Canada
Segment Reporting Information [Line Items]
Capital expenditures	338	124	142
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Capital expenditures	$ 23	$ 28	$ 16

X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

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+ References

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