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Related Party Transactions - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 03, 2014
USD ($)
Mar. 31, 2020
USD ($)
term
credit_facility
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
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     $ 50
Health and life insurance costs   2     $ 2    
Defined contribution benefit plan costs   $ 1     $ 1    
Transportation Services Operating Leases              
Related Party Transaction [Line Items]              
Initial term   10 years          
Transportation Services Operating Leases, Five Year Terms              
Related Party Transaction [Line Items]              
Initial term   10 years          
Number of additional terms | term   2          
Additional term   5 years          
Transportation Services Operating Leases, One Year Terms              
Related Party Transaction [Line Items]              
Initial term   10 years          
Number of additional terms | term   10          
Additional term   1 year          
Shell Treasury Center West Inc              
Related Party Transaction [Line Items]              
Number of revolving credit facilities | credit_facility   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