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Impairments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Terminals
Dec. 31, 2015
USD ($)
Sep. 01, 2016
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (gain) on Sale of Assets and Asset Impairment Charges $ 172 $ 1,013 $ 2,125  
Loss on impairment of goodwill 0 0 1,150  
Loss (Gain) on impairments and divestitures of equity investments, net 150 610 30  
MEP        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (Gain) on impairments and divestitures of equity investments, net   350    
Ruby        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (Gain) on impairments and divestitures of equity investments, net   250    
Sale Equity Interest in SNG [Member]        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Disposal Group, Equity Interest Sold       50.00%
Regulated        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairment of long-lived assets     32  
Natural Gas Pipelines        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (gain) on Sale of Assets and Asset Impairment Charges 0 94 43  
Loss on impairment of goodwill 0 0 1,150  
Impairment of long-lived assets 30 106 79  
Loss (Gain) on impairments and divestitures of equity investments, net 150 606 26  
Natural Gas Pipelines | Investee [Member]        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (Gain) on impairments and divestitures of equity investments, net 10 7 0  
Nonregulated        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairment of long-lived assets     47  
CO2        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (gain) on Sale of Assets and Asset Impairment Charges 0 (1) 0  
Impairment of long-lived assets (1) 20 606  
CO2 | Investee [Member]        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (Gain) on impairments and divestitures of equity investments, net (4) 9 26  
CO2 | Oil and Gas Properties [Member]        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairment of long-lived assets     399  
CO2 | Source and transportation projects [Member]        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairment of long-lived assets     207  
Terminals        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (gain) on Sale of Assets and Asset Impairment Charges (18) 80 3  
Impairment of long-lived assets 3 19 188  
Loss (Gain) on impairments and divestitures of equity investments, net 0 $ 16 4  
Number of terminals | Terminals   20    
Terminals | Coal        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairment of long-lived assets     175  
Terminals | Deeprock Development [Member]        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (gain) on Sale of Assets and Asset Impairment Charges $ 23      
Disposal Group, Equity Interest Sold 40.00%      
Products Pipelines        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (gain) on Sale of Assets and Asset Impairment Charges $ 0 $ 10 1  
Impairment of long-lived assets 0 66 0  
Loss (Gain) on impairments and divestitures of equity investments, net 0 (12) 0  
Other        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (gain) on Sale of Assets and Asset Impairment Charges 2 (7) (1)  
Operating Segments        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss (gain) on Sale of Assets and Asset Impairment Charges 172 $ 1,013 2,125  
Natural Gas Pipelines-Nonregulated        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Loss on impairment of goodwill     $ 1,150  
Cost of Sales [Member] | Colden storage [Member]        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairment of long-lived assets $ 3