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Debt and Finance Lease Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Feb. 28, 2022 | Dec. 31, 2021 | Nov. 30, 2021
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Debt and Finance Lease Obligations: |  |  |  |  |  |
Net unamortized debt issuance costs and other | $ (77) | $ (84) |  |  |  |
Total debt | 9,218 | 9,241 |  |  |  |
Finance lease obligations (see Note 5) | 2,306 | 2,394 |  |  |  |
Total debt and finance lease obligations | 11,524 | 11,635 |  |  |  |
Less: Current portion | 1,406 | 1,109 |  |  |  |
Debt and finance lease obligations, less current portion | 10,118 | 10,526 |  |  |  |
Other Debt [Member] |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |
Long-term debt at stated values | 14 | 19 |  |  |  |
Valero Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |
Long-term debt at stated values | 0 | 0 |  |  |  |
Canadian Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |
Short-term debt at stated values |  | 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 | 250 | 100 |  |  |  |
DGD Loan Agreement [Member] | Credit Facilities [Member] |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |
Long-term debt at stated values | 0 | 25 |  |  |  |
IEnova Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |
Long-term debt at stated values | 766 | 717 |  |  |  |
1.200% Valero Senior Notes Due 2024 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |
Long-term debt at stated values | $ 167 | 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% | 3.65% |
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 | $ 578 |  |  |  |
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 | $ 606 |  |  |  |
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 | $ 472 |  |  |  |
Interest rate of notes (percent) | 2.80% | 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 | $ 733 |  |  |  |
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 | $ 1,442 |  |  |  |
Interest rate of notes (percent) | 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% |  |  |  | 10.50% |
4.90% Valero Senior Notes Due 2045 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |
Long-term debt at stated values | $ 621 | $ 626 |  |  |  |
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 | $ 855 |  |  |  |
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 | $ 553 |  |  |  |
Interest rate of notes (percent) | 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% | 4.375% |
4.500% VLP Senior Notes Due March 2028 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |
Long-term debt at stated values | $ 456 | $ 474 |  |  |  |
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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