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Reportable Segments Other expense (income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Other operating expenses $ 12 $ 386 $ 2,066
Operating Segments | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Other operating expenses 26 199 1,269
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
Other operating expenses (1) 19 606
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
Other operating expenses (14) 99 190
Operating Segments | Products Pipelines      
Segment Reporting Information [Line Items]      
Other operating expenses 0 76 2
Operating Segments | Kinder Morgan Canada      
Segment Reporting Information [Line Items]      
Other operating expenses 0 0 (1)
Corporate, Non-Segment      
Segment Reporting Information [Line Items]      
Other operating expenses $ 1 $ (7) $ 0