Debt, Credit Facilities (Details)		Sep. 30, 2021 USD ($)		Sep. 30, 2021 CAD ($)	Jul. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	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		3,712,000,000
Valero Revolver Letter of Credit [Member] | Credit Facilities [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued	[1]	288,000,000
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		1,300,000,000	[2]		$ 1,300,000,000	$ 1,000,000,000
Outstanding borrowings or letters of credit issued, short-term	[2]	0
Availability	[2]	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]	100,000,000
Availability	[3]	293,000,000
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		50,000,000							$ 10,000,000
Outstanding borrowings or letters of credit issued	[1],[3]	7,000,000
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]	627,000,000
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]	116,000,000
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued, short-term	[1]	$ 127,000,000

[1] Letters of credit issued as of September 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.