Debt, Credit Facilities (Details)		Mar. 31, 2021 USD ($)	Mar. 31, 2021 CAD ($)	Dec. 31, 2020
Valero Revolver [Member] | Credit Facilities [Member]
Line of Credit Facility
Facility amount		$ 4,000,000,000
Outstanding borrowings or letters of credit issued		0
Availability		3,882,000,000
Valero Revolver Letter of Credit [Member] | Credit Facilities [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued	[1]	118,000,000
364-Day Revolving Credit Facility [Member] | Credit Facilities [Member]
Line of Credit Facility
Facility amount	[2]	875,000,000
Outstanding borrowings or letters of credit issued, short-term	[2]	0
Availability	[2]	875,000,000
Canadian Revolver [Member] | Credit Facilities [Member]
Line of Credit Facility
Facility amount			$ 150,000,000
Outstanding borrowings or letters of credit issued, short-term			0
Availability			145,000,000
Canadian Revolver Letter of Credit [Member] | Credit Facilities [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued, short-term	[1]		$ 5,000,000
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member]
Line of Credit Facility
Facility amount		1,000,000,000
Outstanding borrowings or letters of credit issued, short-term		0
Availability		1,000,000,000
Committed Letter of Credit Facility Expires November 2021 [Member] | Credit Facilities [Member]
Line of Credit Facility
Facility amount		50,000,000
Outstanding borrowings or letters of credit issued, short-term	[1]	0
Availability		50,000,000
DGD Revolver [Member] | Diamond Green Diesel Holdings LLC [Member] | Credit Facilities [Member] | Variable Interest Entities (VIEs) [Member]
Line of Credit Facility
Facility amount	[3]	400,000,000
Outstanding borrowings or letters of credit issued	[3]	0
Availability	[3]	400,000,000
DGD Revolver Letter Of Credit [Member] | Diamond Green Diesel Holdings LLC [Member] | Credit Facilities [Member] | Variable Interest Entities (VIEs) [Member]
Line of Credit Facility
Facility amount		10,000,000
Outstanding borrowings or letters of credit issued	[1],[3]	$ 0
IEnova Revolver [Member] | Central Mexico Terminals [Member] | Credit Facilities [Member]
Credit Facilities (Textual)
Interest rate at period end (percent)		3.888%	3.888%	3.87%
IEnova Revolver [Member] | Central Mexico Terminals [Member] | Credit Facilities [Member] | Variable Interest Entities (VIEs) [Member]
Line of Credit Facility
Facility amount	[3],[4]	$ 660,000,000
Outstanding borrowings or letters of credit issued, short-term	[3],[4]	606,000,000
Availability	[3],[4]	54,000,000
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued, short-term	[1]	$ 330,000,000

[1] Letters of credit issued as of March 31, 2021 expire at various times in 2021 through 2023.

[2] This facility matured on April 12, 2021 and was not renewed.

[3] Creditors of our VIEs do not have recourse against us.

[4] As of March 31, 2021 and December 31, 2020, the variable interest rate on the IEnova Revolver was 3.888 percent and 3.870 percent, respectively.