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Reportable Segments Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Investments $ 7,481 $ 7,298
Operating Segments | Natural Gas Pipelines    
Segment Reporting Information [Line Items]    
Investments 6,358 6,218
Operating Segments | Products Pipelines    
Segment Reporting Information [Line Items]    
Investments 839 777
Operating Segments | Terminals    
Segment Reporting Information [Line Items]    
Investments 268 263
Operating Segments | CO2    
Segment Reporting Information [Line Items]    
Investments 16 6
Operating Segments | Kinder Morgan Canada    
Segment Reporting Information [Line Items]    
Investments $ 0 $ 34