Merger and Acquisitions, Fair Values of Assets Acquired and Liabilities Assumed, Net (Details) - Pure Biofuels del Peru S.A.C (Now Known as Valero Peru S.A.C.) [Member] $ in Millions	May 14, 2018 USD ($)
Fair Values of Assets Acquired, Goodwill, and Liabilities Assumed, Net
Current assets, net of cash acquired	$ 158
Property, plant, and equipment	102
Deferred charges and other assets	466
Current liabilities, excluding current portion of debt	(26)
Debt assumed, including current portion	(137)
Deferred income tax liabilities	(62)
Other long-term liabilities	(27)
Noncontrolling interest	(6)
Total consideration, net of cash acquired	$ 468