Debt, Credit Facilities (Details)		Jul. 29, 2021 USD ($)	Jun. 30, 2021 USD ($)		Jun. 30, 2021 CAD ($)	May 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
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			3,846,000,000
Valero Revolver Letter of Credit [Member] | Credit Facilities [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued	[1]		154,000,000
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	[2]		1,000,000,000
Outstanding borrowings or letters of credit issued, short-term	[2]		0
Availability	[2]		1,000,000,000
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member] | Subsequent Event [Member]
Line of Credit Facility
Facility amount		$ 1,300,000,000
Committed Letter of Credit Facility [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] | Credit Facilities [Member] | Diamond Green Diesel Holdings LLC [Member] | Variable Interest Entities (VIEs) [Member]
Line of Credit Facility
Facility amount			400,000,000	[3]				$ 400,000,000
Outstanding borrowings or letters of credit issued	[3]		0
Availability	[3]		400,000,000
DGD Revolver Letter Of Credit [Member] | Credit Facilities [Member] | Diamond Green Diesel Holdings LLC [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] | Credit Facilities [Member] | Central Mexico Terminals [Member] | Variable Interest Entities (VIEs) [Member]
Line of Credit Facility
Facility amount						$ 743,000,000	$ 660,000,000
Outstanding borrowings or letters of credit issued, short-term	[3]		614,000,000
IEnova Revolver [Member] | Credit Facilities [Member] | Central Mexico Terminals [Member] | Variable Interest Entities (VIEs) [Member]
Line of Credit Facility
Facility amount	[3]		743,000,000
Availability	[3]		129,000,000
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued, short-term	[1]		$ 140,000,000

[1] Letters of credit issued as of June 30, 2021 expire at various times in 2021 through 2023.

[2] In July 2021, we extended the maturity date of this facility to July 2022 and increased the facility amount from $1.0 billion to $1.3 billion.

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