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Related Party Transactions - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 03, 2014
USD ($)
Sep. 30, 2019
USD ($)
credit_facility
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
term
credit_facility
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Related Party Transaction [Line Items]                    
Statute of limitations expirations, number of days 60 days                  
Distributions to holders of incentive distribution rights waived   $ 16 $ 17 $ 17            
Health and life insurance costs   2     $ 2 $ 5 $ 5      
Defined contribution benefit plan costs   1     1 2 2      
Operations and maintenance – related parties   $ 14     $ 13 $ 44 $ 39 $ 39    
Transportation Services Operating Leases                    
Related Party Transaction [Line Items]                    
Initial term   10 years       10 years        
Transportation Services Operating Leases, Five Year Terms                    
Related Party Transaction [Line Items]                    
Initial term   10 years       10 years        
Number of additional terms | term           2        
Additional term   5 years       5 years        
Transportation Services Operating Leases, One Year Terms                    
Related Party Transaction [Line Items]                    
Initial term   10 years       10 years        
Number of additional terms | term           10        
Additional term   1 year       1 year        
Shell Treasury Center West Inc                    
Related Party Transaction [Line Items]                    
Number of revolving credit facilities | credit_facility   5       5        
Five Year Fixed Facility | Revolving Credit Facility                    
Related Party Transaction [Line Items]                    
Debt instrument term           5 years        
Five Year Fixed Facility | Shell Treasury Center West Inc | Revolving Credit Facility                    
Related Party Transaction [Line Items]                    
Debt instrument term           5 years        
Five Year Revolver Due December 2022 | Shell Treasury Center West Inc | Revolving Credit Facility                    
Related Party Transaction [Line Items]                    
Debt instrument term           5 years        
Seven Year Fixed Facility | Revolving Credit Facility                    
Related Party Transaction [Line Items]                    
Debt instrument term           7 years        
Seven Year Fixed Facility | Shell Treasury Center West Inc | Revolving Credit Facility                    
Related Party Transaction [Line Items]                    
Debt instrument term           7 years        
Ten Year Fixed Facility | Revolving Credit Facility                    
Related Party Transaction [Line Items]                    
Debt instrument term           10 years        
Ten Year Fixed Facility | Shell Treasury Center West Inc | Revolving Credit Facility                    
Related Party Transaction [Line Items]                    
Debt instrument term           10 years        
Shell Pipeline Company L P                    
Related Party Transaction [Line Items]                    
Payment of general and administrative fee $ 11                  
Odyssey Pipeline L.L.C. (“Odyssey”) | GEL Offshore Pipeline LLC                    
Related Party Transaction [Line Items]                    
Noncontrolling interest   29.00%       29.00%       29.00%
Zydeco Pipeline Company LLC (“Zydeco”) | Shell Pipeline Company L P                    
Related Party Transaction [Line Items]                    
Noncontrolling interest   7.50%       7.50%       7.50%
Scenario, Forecast                    
Related Party Transaction [Line Items]                    
Distributions to holders of incentive distribution rights waived                 $ 50