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Impairments and Losses and Gains on Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
Pre-tax losses (gains) on divestitures and impairments, net     $ 1,922 $ (285) $ 437
(Gain) Loss on Sale of Assets and Asset Impairment Charges     1,932 (942) 167
Impairment of goodwill     1,600    
Impairments of long-lived and intangible assets     376    
Impairment losses on long-lived assets and equity investments       1,014  
Other          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
(Gains) losses on divestitures of long-lived assets     0 (1) 0
KML and U.S. Portion of Cochin Pipeline System          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
(Gain) Loss on Sale of Assets and Asset Impairment Charges       (1,296)  
Trans Mountain and Trans Mountain Expansion Project          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
(Gain) Loss on Sale of Assets and Asset Impairment Charges         (595)
Natural Gas Pipelines          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
Impairment of goodwill     1,000 0 0
Impairments of long-lived assets     0 290 636
Impairments of long-lived and intangible assets   $ 600   290  
(Gains) losses on divestitures of long-lived assets     (1) (967) (6)
Impairments of equity investments     0 650 270
Impairments of inventory     11 0 0
Natural Gas Pipelines | KML and U.S. Portion of Cochin Pipeline System          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
(Gains) losses on divestitures of long-lived assets       (957)  
Products Pipelines          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
Impairments of long-lived and intangible assets     21 0 0
Terminals          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
Impairments of long-lived and intangible assets     5 0 59
(Gains) losses on divestitures of long-lived assets     (54) (335) (6)
Gain on sale of equity investment interests     (10) 0 0
Terminals | Kinder Morgan Canada Limited          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
(Gains) losses on divestitures of long-lived assets       (339)  
Terminals | Staten Island Terminal [Member]          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
(Gains) losses on divestitures of long-lived assets     (55)    
CO2          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
Impairment of goodwill $ 600   600 0 0
Impairments of long-lived assets $ 350   350 74 79
(Gains) losses on divestitures of long-lived assets     0 2 0
Kinder Morgan Canada          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
(Gains) losses on divestitures of long-lived assets         $ (595)
Kinder Morgan Canada | Trans Mountain and Trans Mountain Expansion Project          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
(Gains) losses on divestitures of long-lived assets     $ 0 2  
Ruby          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
Impairments of equity investments       650  
Ruby | Natural Gas Pipelines          
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]          
Impairments of equity investments       $ 650