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Debt and Finance Lease Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Sep. 30, 2020 | Apr. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Debt and Finance Lease Obligations: |  |  |  |  |
Net unamortized debt issuance costs and other | $ (90) |  |  | $ (88) |
Total debt | 13,013 |  |  | 8,881 |
Finance lease obligations (see Note 6) | 1,664 |  |  | 791 |
Total debt and finance lease obligations | 14,677 |  |  | 9,672 |
Less: Current portion | 723 |  |  | 494 |
Debt and finance lease obligations, less current portion | 13,954 |  |  | 9,178 |
Other Debt [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | 31 |  |  | 47 |
Valero Revolver [Member] | Credit Facilities [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | 0 |  |  | 0 |
364-day Revolving Credit Facility [Member] | Credit Facilities [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt at stated values | 0 |  |  | 0 |
IEnova Revolver [Member] | Credit Facilities [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt at stated values | 598 |  |  | 348 |
Canadian Revolver [Member] | Credit Facilities [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt at stated values | 0 |  |  | 0 |
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member] |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Short-term debt at stated values | 0 |  |  | 100 |
6.625% Valero Senior Notes Due in 2037 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 1,500 |  |  | 1,500 |
Interest rate of notes (percent) | 6.625% |  |  |  |
3.4% Valero Senior Notes Due in 2026 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 1,250 |  |  | 1,250 |
Interest rate of notes (percent) | 3.40% |  |  |  |
2.85% Valero Senior Notes Due in 2025 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 1,050 |  |  | 0 |
Interest rate of notes (percent) | 2.85% |  |  |  |
4.0% Valero Senior Notes Due in 2029 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 1,000 |  |  | $ 1,000 |
Interest rate of notes (percent) | 4.00% |  |  | 4.00% |
1.2% Valero Senior Notes Due in 2024 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 925 |  |  | $ 0 |
Interest rate of notes (percent) | 1.20% | 1.20% |  |  |
2.7% Valero Senior Notes Due in 2023 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 850 |  |  | 0 |
Interest rate of notes (percent) | 2.70% |  | 2.70% |  |
4.35% Valero Senior Notes Due in 2028 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 750 |  |  | 750 |
Interest rate of notes (percent) | 4.35% |  |  |  | 4.35%
7.5% Valero Senior Notes Due in 2032 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 750 |  |  | 750 |
Interest rate of notes (percent) | 7.50% |  |  |  |
4.9% Valero Senior Notes Due in 2045 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 650 |  |  | 650 |
Interest rate of notes (percent) | 4.90% |  |  |  |
3.65% Valero Senior Notes Due in 2025 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 600 |  |  | 600 |
Interest rate of notes (percent) | 3.65% |  |  |  |
2.15% Valero Senior Notes Due in 2027 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 600 |  |  | 0 |
Interest rate of notes (percent) | 2.15% | 2.15% |  |  |
Floating-Rate Valero Senior Notes at 1.3665% [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 575 |  |  | 0 |
Floating Rate interest rate of notes (percent) | 1.3665% |  |  |  |
10.5% Valero Senior Notes Due in 2039 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 250 |  |  | 250 |
Interest rate of notes (percent) | 10.50% |  |  |  |
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% |  |  |  |
7.45% Valero Senior Notes Due in 2097 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 100 |  |  | 100 |
Interest rate of notes (percent) | 7.45% |  |  |  |
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% |  |  |  |
4.375% VLP Senior Notes Due in 2026 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 500 |  |  | 500 |
Interest rate of notes (percent) | 4.375% |  |  |  |
4.5% VLP Senior Notes Due in 2028 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 500 |  |  | 500 |
Interest rate of notes (percent) | 4.50% |  |  |  |
Gulf Opportunity Zone Revenue Bonds Series 2010, 4.0% [Member] | Revenue Bonds [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 300 |  |  | 300 |
Interest rate of notes (percent) | 4.00% |  |  |  |
Debenture, 7.65% Due In 2026 [Member] | Debentures [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Long-term debt at stated values | $ 100 |  |  | $ 100 |
Interest rate of notes (percent) | 7.65% |  |  |  |

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