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Debt and Finance Lease Obligations, Public Debt (Details) - USD ($) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Apr. 30, 2020
Senior Notes [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Proceeds from issuance of senior long-term debt |  | $ 4,020,000,000.000 |  |  |  |
Senior Notes [Member] | Floating Rate Senior Notes Due September 15, 2023 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance | $ 575,000,000 | 575,000,000 |  |  |  |
Senior Notes [Member] | Floating Rate Senior Notes Due September 15, 2023 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Basis spread on variable rate | 1.15% |  |  |  |  |
Senior Notes [Member] | Senior Notes Due March 15, 2024 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance | $ 925,000,000 | $ 925,000,000 |  |  |  |
Interest rate of notes (percent) | 1.20% | 1.20% |  |  | 1.20% |
Senior Notes [Member] | Senior Notes Due April 15, 2025, Issued September 2020 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance | $ 400,000,000 | $ 400,000,000 |  |  |  |
Interest rate of notes (percent) | 2.85% | 2.85% |  |  |  |
Senior Notes [Member] | Senior Notes Due April 15, 2025, Issued April 2020 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance |  |  |  |  |  | $ 650,000,000
Interest rate of notes (percent) |  |  |  |  |  | 2.85%
Senior Notes [Member] | Senior Notes Due September 15, 2027 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance | $ 600,000,000 | $ 600,000,000 |  |  |  |
Interest rate of notes (percent) | 2.15% | 2.15% |  |  | 2.15% |
Senior Notes [Member] | Senior Notes Due April 15, 2023 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance |  |  |  |  |  | $ 850,000,000
Interest rate of notes (percent) |  |  |  |  | 2.70% | 2.70%
Senior Notes [Member] | Senior Notes due April 1, 2029 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance |  |  | $ 1,000,000,000 |  |  |
Interest rate of notes (percent) |  |  | 4.00% |  | 4.00% |
Proceeds from issuance of senior long-term debt |  |  | $ 992,000,000 |  |  |
Senior Notes [Member] | Senior Notes Due February 1, 2020 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Interest rate of notes (percent) |  |  | 6.125% |  |  |
Early repayment of senior debt |  |  | $ 871,000,000 |  |  |
Debt instrument, redemption price, percentage of principal amount redeemed (percent) |  |  | 102.48% |  |  |
Early redemption fee |  |  | $ 21,000,000 |  |  |
Senior Notes [Member] | VLP Senior Notes Due December 15, 2026 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Interest rate of notes (percent) |  |  |  |  | 4.375% |
Senior Notes [Member] | VLP Senior Notes Due December 15, 2026 [Member] | Valero Energy Partners LP [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance |  |  | $ 500,000,000 |  |  |
Interest rate of notes (percent) |  |  | 4.375% |  |  |
Senior Notes [Member] | VLP Senior Notes Due March 15, 2028 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Interest rate of notes (percent) |  |  |  |  | 4.50% |
Senior Notes [Member] | VLP Senior Notes Due March 15, 2028 [Member] | Valero Energy Partners LP [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance |  |  | $ 500,000,000 | $ 500,000,000 |  |
Interest rate of notes (percent) |  |  | 4.50% | 4.50% |  |
Proceeds from issuance of senior long-term debt |  |  |  | $ 498,000,000 |  |
Senior Notes [Member] | Senior Notes Due June 1, 2028 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Face amount of long-term debt issuance |  |  |  | $ 750,000,000 |  |
Interest rate of notes (percent) |  |  |  | 4.35% | 4.35% |
Proceeds from issuance of senior long-term debt |  |  |  | $ 749,000,000 |  |
Senior Notes [Member] | Senior Notes Due March 15, 2019 [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Interest rate of notes (percent) |  |  |  | 9.375% |  |
Early repayment of senior debt |  |  |  | $ 787,000,000 |  |
Debt instrument, redemption price, percentage of principal amount redeemed (percent) |  |  |  | 104.90% |  |
Early redemption fee |  |  |  | $ 37,000,000 |  |
Credit Facilities [Member] | Valero Energy Partners LP [Member] | VLP Revolver [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Repayments of outstanding amounts under the VLP Revolver |  |  |  | 410,000,000 |  |
Subordinated Debt [Member] | VLP Subordinated Notes [Member] [Member] | Valero Energy Partners LP [Member] |  |  |  |  |  |
Public Debt (Textual) |  |  |  |  |  |
Repayments of notes payable - related party |  |  |  | $ 85,000,000 |  |

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