Related Party Transactions - Additional Information (Details) $ in Millions		3 Months Ended			12 Months Ended
	Nov. 03, 2014 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) credit_facility	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Number of days within combined tax filing submission					15 days
Distribution to holders of incentive distribution rights waived		$ 16	$ 17	$ 17	$ 50
Pension and postretirement health and life insurance					6	$ 6	$ 4
Defined contribution benefit plan costs					2	3	2
Other assets					2	3
Accounts payable					10	9
Accrued liabilities – related parties					19	16
Debt payable – related party					2,692	2,091
Allocated general corporate expenses					28	33	26
Management Agreement fee					9	9	8
Omnibus Agreement fee					11	9	9
General and administrative – related parties					$ 49	$ 52	$ 48
Five Year Fixed Facility | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					5 years
Five Year Revolver Due December 2022
Related Party Transaction [Line Items]
Debt instrument term					5 years
Five Year Revolver due July 2023
Related Party Transaction [Line Items]
Debt instrument term					5 years
Five Year Revolver due July 2023 | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					5 years
Ten Year Fixed Facility | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					10 years
Seven Year Fixed Facility | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					7 years
Omnibus Agreement
Related Party Transaction [Line Items]
Statute of limitations expirations, number of days					60 days
Shell Treasury Center West Inc
Related Party Transaction [Line Items]
Number of revolving credit facilities | credit_facility					5
Shell Treasury Center West Inc | Five Year Fixed Facility | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					5 years
Shell Treasury Center West Inc | Five Year Revolver Due December 2022 | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					5 years
Shell Treasury Center West Inc | Five Year Revolver due July 2023 | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					5 years
Shell Treasury Center West Inc | Ten Year Fixed Facility | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					10 years
Shell Treasury Center West Inc | Seven Year Fixed Facility | Revolving Credit Facility
Related Party Transaction [Line Items]
Debt instrument term					7 years
Shell Pipeline Company L P | Omnibus Agreement
Related Party Transaction [Line Items]
Payment of general and administrative fee	$ 11
Zydeco Pipeline Company LLC (“Zydeco”) | Shell Pipeline Company L P
Related Party Transaction [Line Items]
Noncontrolling interest					7.50%	7.50%	7.50%
Odyssey Pipeline L.L.C. | GEL Offshore Pipeline LLC
Related Party Transaction [Line Items]
Noncontrolling interest					29.00%	29.00%	29.00%