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Reportable Segments Depreciation, depletion and amortization (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
DD&A $ 2,164 $ 2,411 $ 2,297
Operating Segments | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
DD&A 1,062 1,005 955
Operating Segments | Products Pipelines      
Segment Reporting Information [Line Items]      
DD&A 347 338 326
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
DD&A 438 494 489
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
DD&A 291 548 473
Operating Segments | Kinder Morgan Canada      
Segment Reporting Information [Line Items]      
DD&A 0 0 29
Other      
Segment Reporting Information [Line Items]      
DD&A $ 26 $ 26 $ 25