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Debt and Finance Lease Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Feb. 28, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Feb. 28, 2022
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Debt and Finance Lease Obligations: |  |  |  |  |  |  |
Net unamortized debt issuance costs and other | $ (71) |  | $ (77) |  |  |  |
Total debt | 8,085 |  | 9,218 |  |  |  |
Finance lease obligations (see Note 5) | 2,378 |  | 2,306 |  |  |  |
Total debt and finance lease obligations | 10,463 |  | 11,524 |  |  |  |
Less: Current portion | 743 |  | 1,406 |  |  |  |
Debt and finance lease obligations, less current portion | 9,720 |  | 10,118 |  |  |  |
Other Debt [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | 0 |  | 14 |  |  |  |
Valero Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | 0 |  | 0 |  |  |  |
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |  |
Short-term debt at stated values | 0 |  | 0 |  |  |  |
DGD Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | 0 |  | 250 |  |  |  |
DGD Loan Agreement [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | 0 |  | 0 |  |  |  |
IEnova Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | 58 |  | 766 |  |  |  |
1.200% Valero Senior Notes Due 2024 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 0 |  | 167 |  |  |  |
Interest rate of notes (percent) | 1.20% | 1.20% |  |  |  |  |
2.850% Valero Senior Notes Due 2025 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 251 |  | 251 |  |  |  |
Interest rate of notes (percent) | 2.85% |  |  |  |  | 2.85% | 2.85%
3.65% Valero Senior Notes Due 2025 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 189 |  | 189 |  |  |  |
Interest rate of notes (percent) | 3.65% |  |  |  |  | 3.65% | 3.65%
3.400% Valero Senior Notes Due 2026 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 426 |  | 426 |  |  |  |
Interest rate of notes (percent) | 3.40% |  |  |  |  | 3.40% | 3.40%
2.150% Valero Senior Notes Due 2027 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 564 |  | 564 |  |  |  |
Interest rate of notes (percent) | 2.15% |  |  |  | 2.15% |  |
4.350% Valero Senior Notes Due 2028 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 591 |  | 591 |  |  |  |
Interest rate of notes (percent) | 4.35% |  |  |  |  | 4.35% |
4.000% Valero Senior Notes Due 2029 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 439 |  | 439 |  |  |  |
Interest rate of notes (percent) | 4.00% |  |  |  |  | 4.00% |
8.75% Valero Senior Notes Due 2030 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 200 |  | 200 |  |  |  |
Interest rate of notes (percent) | 8.75% |  |  |  |  |  |
2.800% Valero Senior Notes Due 2031 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 462 |  | 462 |  |  |  |
Interest rate of notes (percent) | 2.80% |  |  |  | 2.80% |  |
7.5% Valero Senior Notes Due in 2032 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 729 |  | 729 |  |  |  |
Interest rate of notes (percent) | 7.50% |  |  |  |  |  |
6.625% Valero Senior Notes Due 2037 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 1,380 |  | 1,380 |  |  |  |
Interest rate of notes (percent) | 6.625% |  |  | 6.625% | 6.625% |  |
6.75% Valero Senior Notes Due in 2037 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 24 |  | 24 |  |  |  |
Interest rate of notes (percent) | 6.75% |  |  |  |  |  |
10.500% Valero Senior Notes Due 2039 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 113 |  | 113 |  |  |  |
Interest rate of notes (percent) | 10.50% |  |  |  |  |  |
4.90% Valero Senior Notes Due 2045 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 621 |  | 621 |  |  |  |
Interest rate of notes (percent) | 4.90% |  |  |  | 4.90% |  |
3.650% Valero Senior Notes Due 2051 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 829 |  | 829 |  |  |  |
Interest rate of notes (percent) | 3.65% |  |  | 3.65% | 3.65% |  |
4.000% Valero Senior Notes Due 2052 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 508 |  | 508 |  |  |  |
Interest rate of notes (percent) | 4.00% |  |  | 4.00% | 4.00% |  | 4.00%
7.45% Valero Senior Notes Due 2097 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 70 |  | 70 |  |  |  |
Interest rate of notes (percent) | 7.45% |  |  |  | 7.45% |  |
4.375% VLP Senior Notes Due 2026 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 146 |  | 146 |  |  |  |
Interest rate of notes (percent) | 4.375% |  |  |  |  | 4.375% | 4.375%
4.500% VLP Senior Notes Due 2028 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 456 |  | 456 |  |  |  |
Interest rate of notes (percent) | 4.50% |  |  |  | 4.50% |  |
Debenture, 7.65% Due In 2026 [Member] | Debenture [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 100 |  | $ 100 |  |  |  |
Interest rate of notes (percent) | 7.65% |  |  |  |  |  |

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