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Reportable Segments Other expense (income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Other expense (income)(b) $ 1,930 $ (945) $ 164
Operating Segments | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Other expense (income)(b) 1,009 (680) 629
Operating Segments | Products Pipelines      
Segment Reporting Information [Line Items]      
Other expense (income)(b) 21 0 (2)
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
Other expense (income)(b) (50) (342) 54
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
Other expense (income)(b) 950 77 79
Operating Segments | Kinder Morgan Canada      
Segment Reporting Information [Line Items]      
Other expense (income)(b) 0 2 (596)
Other      
Segment Reporting Information [Line Items]      
Other expense (income)(b) $ 0 $ (2) $ 0