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Goodwill Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Historical Goodwill     $ 27,715
Accumulated impairment losses     (5,563)
Goodwill $ 21,965 $ 22,162 22,152
Currency translation (8) 13  
Divestitures(a) (190) (3)  
Other 1    
Natural Gas Pipelines Regulated      
Goodwill [Line Items]      
Historical Goodwill     15,892
Accumulated impairment losses     (1,643)
Goodwill 14,249 14,249 14,249
Currency translation 0 0  
Divestitures(a) 0 0  
Other 0    
Natural Gas Pipelines-Nonregulated      
Goodwill [Line Items]      
Historical Goodwill     5,812
Accumulated impairment losses     (1,597)
Goodwill 4,215 4,215 4,215
Currency translation 0 0  
Divestitures(a) 0 0  
Other 0    
CO2      
Goodwill [Line Items]      
Historical Goodwill     1,528
Accumulated impairment losses     0
Goodwill 1,528 1,528 1,528
Currency translation 0 0  
Divestitures(a) 0 0  
Other 0    
Products Pipelines      
Goodwill [Line Items]      
Historical Goodwill     2,125
Accumulated impairment losses     (1,197)
Goodwill 928 928 928
Currency translation 0 0  
Divestitures(a) 0 0  
Other 0    
Products Pipelines Terminals      
Goodwill [Line Items]      
Historical Goodwill     221
Accumulated impairment losses     (70)
Goodwill 151 151 151
Currency translation 0 0  
Divestitures(a) 0 0  
Other 0    
Terminals      
Goodwill [Line Items]      
Historical Goodwill     1,575
Accumulated impairment losses     (679)
Goodwill 894 893 896
Currency translation 0 0  
Divestitures(a) 0 (3)  
Other 1    
Kinder Morgan Canada      
Goodwill [Line Items]      
Historical Goodwill     562
Accumulated impairment losses     (377)
Goodwill 0 198 $ 185
Currency translation (8) 13  
Divestitures(a) (190) $ 0  
Other $ 0