Merger and Acquisitions (Details) $ / shares in Units, gal in Millions				12 Months Ended
	Jan. 10, 2019 USD ($) $ / shares	Nov. 15, 2018 USD ($) plant gal	May 14, 2018 USD ($) MBbls	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Acquisitions and Merger (Textual)
Merger Transaction, aggregate merger consideration funded with available cash on hand				$ 0	$ 950,000,000	$ 0
Amount paid from available cash on hand				0	0	468,000,000
Goodwill				260,000,000	260,000,000
Ethanol Plants [Member]
Acquisitions and Merger (Textual)
Acquisition agreement, number of ethanol plants | plant		3
Acquisition agreement, combined ethanol production capacity per year | gal		280
Acquisition agreement, total cash consideration		$ 320,000,000		$ 0	$ 3,000,000	$ 320,000,000
Working capital		$ 20,000,000
VLP [Member]
Acquisitions and Merger (Textual)
Merger Transaction, price per common unit (in usd per unit) | $ / shares	$ 42.25
Merger Transaction, aggregate merger consideration funded with available cash on hand	$ 950,000,000
Pure Biofuels del Peru S.A.C (Now Known as Valero Peru S.A.C.) [Member]
Acquisitions and Merger (Textual)
Working capital			$ 132,000,000
Percent equity interests acquired			100.00%
Amount paid from available cash on hand			$ 468,000,000
Identifiable intangible assets			200,000,000
Goodwill			$ 260,000,000
Amortization period of identifiable intangible assets			10 years
Total amount of goodwill deductible for tax purposes			$ 0
Pure Biofuels del Peru S.A.C (Now Known as Valero Peru S.A.C.) [Member] | Port of Callao Terminal [Member]
Acquisitions and Merger (Textual)
Approximate storage capacity of terminal (in thousands of barrels) | MBbls			1,000
Pure Biofuels del Peru S.A.C (Now Known as Valero Peru S.A.C.) [Member] | Paita Terminal [Member]
Acquisitions and Merger (Textual)
Approximate storage capacity of terminal (in thousands of barrels) | MBbls			180