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Reportable Segments Segment earnings before depreciation, depletion, amortization and amortization of excess cost of equity investments (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)
Amortization of excess cost of equity investments (140) (83) (95)
General and administrative and corporate charges (648) (590) (601)
Interest, net (1,595) (1,801) (1,917)
Income tax expense (481) (926) (587)
Net Income 180 2,239 1,919
Total Segments EBDA(e)      
Segment Reporting Information [Line Items]      
Segment EBDA(c) 5,213 8,071 7,403
Operating Segments | Natural Gas Pipelines      
Segment Reporting Information [Line Items]      
Segment EBDA(c) 3,483 4,661 3,540
DD&A (1,062) (1,005) (955)
Operating Segments | Products Pipelines      
Segment Reporting Information [Line Items]      
Segment EBDA(c) 977 1,225 1,209
DD&A (347) (338) (326)
Operating Segments | Terminals      
Segment Reporting Information [Line Items]      
Segment EBDA(c) 1,045 1,506 1,175
DD&A (438) (494) (489)
Operating Segments | CO2      
Segment Reporting Information [Line Items]      
Segment EBDA(c) (292) 681 759
DD&A (291) (548) (473)
Operating Segments | Kinder Morgan Canada      
Segment Reporting Information [Line Items]      
Segment EBDA(c) 0 (2) 720
DD&A 0 0 (29)
Other      
Segment Reporting Information [Line Items]      
DD&A (26) (26) (25)
General and administrative and corporate charges $ (653) $ (611) $ (588)