Revenue Recognition - Contract Balances (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Apr. 01, 2020	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, ending balance	$ 4,000,000	$ 4,000,000	$ 0
Contract With Customer, Estimated Future Amortization [Abstract]
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		24,000,000
Third Parties
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, ending balance	4,000,000	4,000,000	0		$ 0	$ 8,000,000	$ 8,000,000
Additions		8,000,000	0
Reductions		(4,000,000)	(8,000,000)
Related Parties
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, ending balance	19,000,000	19,000,000	0		$ 0	$ 3,000,000	$ 3,000,000
Additions		21,000,000	0
Reductions		(2,000,000)	(3,000,000)
Revenue expected to be recognized on multi-year terminaling service contracts in place as of September 30, 2019
Movement in Deferred Revenue [Roll Forward]
Additions		$ 5,000,000
Agreement term		15 years
Capitalized contract cost, amortization	$ 11,000,000
April 2020 Transaction
Movement in Deferred Revenue [Roll Forward]
Contract assets - related parties			$ 0
April 2020 Transaction | Norco Transaction | Affiliated Entity
Movement in Deferred Revenue [Roll Forward]
Contract assets - related parties				$ 244,000,000