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Debt, Credit Facilities (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Line of Credit Facility      
Increase in noncontrolling interest, conversion of IEnova Revolver debt to equity $ 457,000,000 $ 457,000,000  
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]   0  
Availability [3],[4]   288,000,000  
Interest rate at period end (percent)     7.201%
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]   112,000,000  
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]   329,000,000  
Availability [4],[6]   $ 501,000,000  
Interest rate at period end (percent)   9.152% 9.245%
Debt conversion, debt amount converted $ 457,000,000 $ 457,000,000  
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member]      
Line of Credit Facility      
Letters of credit issued [1]   $ 0  
[1] Letters of credit issued as of June 30, 2024 expire at various times in 2024 through 2026.
[2] In July 2024, we extended the maturity date of this facility to July 2025.
[3] The variable interest rate on the unsecured revolving credit facility with a syndicate of financial institutions (the DGD Revolver) was 7.201 percent as of December 31, 2023.
[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). During the three months ended March 31, 2024, IEnova converted $457 million of outstanding borrowings under this facility to additional equity in Central Mexico Terminals, which resulted in an increase in the noncontrolling interest related to IEnova. The variable interest rate on the IEnova Revolver was 9.152 percent and 9.245 percent as of June 30, 2024 and December 31, 2023, respectively.