Revenue Recognition - Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Accounts receivable – third parties, net		$ 14		$ 20
Contract assets – related parties		229		233
Deferred revenue – third parties	$ 4	2		4
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	4
Deferred revenue, ending balance	2
Contract With Customer, Estimated Future Amortization [Abstract]
Remainder of 2021		11
2022		16
2023		16
2024		17
2025		17
2026		15
Minimum Volume Commitment
Movement in Deferred Revenue [Roll Forward]
Additions	$ 6
Terminaling Services
Disaggregation of Revenue [Line Items]
Agreement term	15 years
Capitalized contract cost, amortization	$ 4
Movement in Deferred Revenue [Roll Forward]
Additions	3
Third Parties
Disaggregation of Revenue [Line Items]
Accounts receivable – third parties, net		12	$ 19
Deferred revenue – third parties	2	2	4	4
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	4
Additions	2
Reductions	(4)
Deferred revenue, ending balance	2
Related Parties
Disaggregation of Revenue [Line Items]
Accounts receivable – third parties, net		23	18
Contract assets – related parties		229	233
Deferred revenue – third parties	19	$ 22	$ 19	$ 19
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	19
Additions	7
Reductions	(4)
Deferred revenue, ending balance	$ 22