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Reportable Segments Operating expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Operating expenses(b) $ 7,288 $ 7,215 $ 6,222
Operating Segments | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Operating expenses(b) 5,353 5,457 4,393
Operating Segments | Products Pipelines      
Segment Reporting Information [Line Items]      
Operating expenses(b) 594 487 573
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
Operating expenses(b) 818 788 768
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
Operating expenses(b) 453 394 399
Operating Segments | Kinder Morgan Canada      
Segment Reporting Information [Line Items]      
Operating expenses(b) 72 95 87
Corporate, Non-Segment and intersegment eliminations      
Segment Reporting Information [Line Items]      
Operating expenses(b) $ (2) $ (6) $ 2