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Debt and Finance Lease Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Feb. 28, 2022 | Dec. 31, 2021 | Nov. 30, 2021 | Sep. 30, 2020
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Debt and Finance Lease Obligations: |  |  |  |  |  |  |
Net unamortized debt issuance costs and other | $ (84) |  |  |  | $ (86) |  |
Total debt | 9,241 |  |  |  | 11,950 |  |
Finance lease obligations (see Note 4) | 2,394 |  |  |  | 1,920 |  |
Total debt and finance lease obligations | 11,635 |  |  |  | 13,870 |  |
Less: Current portion | 1,109 |  |  |  | 1,264 |  |
Debt and finance lease obligations, less current portion | 10,526 |  |  |  | 12,606 |  |
Other Debt [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | 19 |  |  |  | 26 |  |
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 |  |  |  | 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 | 100 |  |  |  | 100 |  |
DGD Loan Agreement [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Short-term Debt [Abstract] |  |  |  |  |  |  |
Short-term debt at stated values | 25 |  |  |  | 25 |  |
IEnova Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | 717 |  |  |  | 679 |  |
1.200% Valero Senior Notes Due in 2024 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 167 |  |  |  | $ 169 |  |
Interest rate of notes (percent) | 1.20% |  |  |  | 1.20% |  | 1.20%
2.850% Valero Senior Notes Due in 2025 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 251 |  |  |  | $ 1,050 |  |
Interest rate of notes (percent) | 2.85% | 2.85% |  | 2.85% |  |  |
3.65% Valero Senior Notes Due in 2025 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 189 |  |  |  | $ 324 |  |
Interest rate of notes (percent) | 3.65% | 3.65% |  | 3.65% | 3.65% |  |
3.400% Valero Senior Notes Due in 2026 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 426 |  |  |  | $ 1,250 |  |
Interest rate of notes (percent) | 3.40% | 3.40% |  | 3.40% |  |  |
2.150% Valero Senior Notes Due in 2027 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 578 |  |  |  | 600 |  |
Interest rate of notes (percent) | 2.15% |  |  |  |  |  | 2.15%
4.350% Valero Senior Notes Due in 2028 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 606 |  |  |  | 750 |  |
Interest rate of notes (percent) | 4.35% | 4.35% |  |  |  |  |
4.000% Valero Senior Notes Due in 2029 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 439 |  |  |  | 1,000 |  |
Interest rate of notes (percent) | 4.00% | 4.00% |  |  |  |  |
8.75% Valero Senior Notes Due in 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 in 2031 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 472 |  |  |  | 500 |  |
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 | $ 733 |  |  |  | 750 |  |
Interest rate of notes (percent) | 7.50% |  |  |  |  |  |
6.625% Valero Senior Notes Due in 2037 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 1,442 |  |  |  | 1,500 |  |
Interest rate of notes (percent) | 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 in 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 in 2045 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 626 |  |  |  | $ 650 |  |
Interest rate of notes (percent) | 4.90% |  |  |  |  |  |
3.650% Valero Senior Notes Due in 2051 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 855 |  |  |  | 950 |  |
Interest rate of notes (percent) | 3.65% |  |  |  |  | 3.65% |
4.000% Valero Senior Notes Due in 2052 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 553 |  |  |  | 0 |  |
Interest rate of notes (percent) | 4.00% |  |  | 4.00% |  |  |
7.45% Valero Senior Notes Due in 2097 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 70 |  |  |  | 100 |  |
Interest rate of notes (percent) | 7.45% |  |  |  |  |  |
4.375% VLP Senior Notes Due in 2026 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 146 |  |  |  | $ 376 |  |
Interest rate of notes (percent) | 4.375% | 4.375% |  | 4.375% | 4.375% |  |
4.500% VLP Senior Notes Due in 2028 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 474 |  |  |  | $ 500 |  |
Interest rate of notes (percent) | 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% |  |  |  |  |  |
Gulf Opportunity Zone Revenue Bonds, Series 2010, 4.00% Due in 2040 [Member] | Revenue Bonds [Member] |  |  |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |  |  |
Long-term debt at stated values | $ 0 |  |  |  | $ 300 |  |
Interest rate of notes (percent) | 4.00% |  | 4.00% |  |  |  |

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