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Reportable Segments Depreciation, depletion and amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
DD&A	$ 2,297	$ 2,261	$ 2,209
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
DD&A	1,058	1,011	1,041
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
DD&A	228	216	221
Operating Segments | Terminals
Segment Reporting Information [Line Items]
DD&A	484	472	435
Operating Segments | CO2
Segment Reporting Information [Line Items]
DD&A	473	493	446
Operating Segments | Kinder Morgan Canada
Segment Reporting Information [Line Items]
DD&A	29	46	44
Corporate, Non-Segment
Segment Reporting Information [Line Items]
DD&A	$ 25	$ 23	$ 22

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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