Debt, Credit Facilities (Details) - USD ($)		Jun. 30, 2025	Dec. 31, 2024
Valero Revolver [Member] | Credit Facilities [Member]
Line of Credit Facility
Facility amount		$ 4,000,000,000
Outstanding borrowings, long term		0
Availability		3,998,000,000
Valero Revolver, Letter of Credit [Member] | Credit Facilities [Member]
Line of Credit Facility
Letters of credit issued	[1]	2,000,000
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member]
Line of Credit Facility
Facility amount	[2]	1,300,000,000
Outstanding borrowings, short-term	[2]	0
Availability	[2]	1,300,000,000
DGD Revolver [Member] | Credit Facilities [Member] | Diamond Green Diesel Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Line of Credit Facility
Facility amount	[3],[4]	400,000,000
Outstanding borrowings, long term	[3],[4]	100,000,000
Availability	[3],[4]	$ 277,000,000
Interest rate at period end (percent)		6.166%
DGD Revolver, Letter of Credit [Member] | Credit Facilities [Member] | Diamond Green Diesel Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Line of Credit Facility
Letters of credit issued	[1],[3],[4]	$ 23,000,000
DGD Loan Agreement [Member] | Credit Facilities [Member] | Diamond Green Diesel Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Valero Energy Corporation [Member]
Line of Credit Facility
Facility amount	[4],[5]	100,000,000
Outstanding borrowings, long term	[4],[5]	0
Availability	[4],[5]	100,000,000
IEnova Revolver [Member] | Credit Facilities [Member] | Central Mexico Terminals [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Line of Credit Facility
Facility amount	[4],[6]	830,000,000
Outstanding borrowings, long term	[4],[6]	37,000,000
Availability	[4],[6]	$ 793,000,000
Interest rate at period end (percent)		8.148%	8.443%
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member]
Line of Credit Facility
Letters of credit issued	[1]	$ 57,000,000
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member] | Diamond Green Diesel Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Line of Credit Facility
Letters of credit issued	[1],[4]	$ 47,000,000

[1] Letters of credit issued as of June 30, 2025 expire at various times in 2025 through 2026.

[2] In July 2025, we extended the maturity date of this facility to July 2026.

[3] The variable interest rate on the unsecured revolving credit facility with a syndicate of financial institutions (the DGD Revolver) was 6.166 percent as of June 30, 2025.

[4] Creditors of the VIEs do not have recourse against us.

[5] The amounts shown for DGD’s unsecured revolving loan agreement with its members (the DGD Loan Agreement) represent the facility amount available from, and borrowings outstanding to, the noncontrolling member as any transactions between DGD and us under this facility are eliminated in consolidation.

[6] Central Mexico Terminals (defined in Note 6) has an unsecured revolving credit facility (the IEnova Revolver) with IEnova (defined in Note 6). The variable interest rate on the IEnova Revolver was 8.148 percent and 8.443 percent as of June 30, 2025 and December 31, 2024, respectively.