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Reportable Segments Operating expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating expenses(b)	$ 7,215	$ 6,222	$ 6,891
Operating Segments | Natural Gas Pipelines
Segment Reporting Information [Line Items]
Operating expenses(b)	5,457	4,393	4,738
Operating Segments | CO2
Segment Reporting Information [Line Items]
Operating expenses(b)	394	399	432
Operating Segments | Terminals
Segment Reporting Information [Line Items]
Operating expenses(b)	788	768	836
Operating Segments | Products Pipelines
Segment Reporting Information [Line Items]
Operating expenses(b)	487	573	772
Operating Segments | Kinder Morgan Canada
Segment Reporting Information [Line Items]
Operating expenses(b)	95	87	87
Corporate, Non-Segment and intersegment eliminations
Segment Reporting Information [Line Items]
Operating expenses(b)	$ (6)	$ 2	$ 26

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Cost of Goods Sold, Operations and Maintenance Expense and Taxes Other Than Income Taxes

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