Revenue Recognition - Contract Balances (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance		$ 0
Contract assets – related parties	$ 237,000,000	237,000,000	$ 0	$ 0
Deferred revenue, ending balance	5,000,000	5,000,000
Deferred revenue and other unearned income	3,000,000	3,000,000		2,000,000
Contract With Customer, Estimated Future Amortization [Abstract]
Reminder of 2020	4,000,000	4,000,000
2021	15,000,000	15,000,000
2022	16,000,000	16,000,000
2023	16,000,000	16,000,000
2024	17,000,000	17,000,000
2025	17,000,000	17,000,000
Minimum Volume Commitment
Movement in Deferred Revenue [Roll Forward]
Additions		19,000,000
Terminaling Services
Movement in Deferred Revenue [Roll Forward]
Additions		$ 4,000,000
Agreement term		15 years
Capitalized contract cost, amortization	4,000,000	$ 8,000,000
April 2020 Transaction
Movement in Deferred Revenue [Roll Forward]
Contract asset - related parties				$ 0
Third Parties
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance		0
Additions		7,000,000
Reductions		(2,000,000)
Deferred revenue, ending balance	5,000,000	5,000,000
Related Parties
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance		0
Additions		16,000,000
Reductions		(2,000,000)
Deferred revenue, ending balance	$ 14,000,000	$ 14,000,000