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Debt, Credit Facilities (Details) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 CAD ($) | Jul. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | May 31, 2021 USD ($) | Apr. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
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Valero Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Facility amount |  | $ 4,000,000,000 |  |  |  |  |  |  |
Outstanding borrowings or letters of credit issued |  | 0 |  |  |  |  |  |  |
Availability |  | 3,712,000,000 |  |  |  |  |  |  |
Valero Revolver Letter of Credit [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Outstanding borrowings or letters of credit issued | [1] | 288,000,000 |  |  |  |  |  |  |
Canadian Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Facility amount |  |  |  | $ 150,000,000 |  |  |  |  |
Outstanding borrowings or letters of credit issued, short-term |  |  |  | 0 |  |  |  |  |
Availability |  |  |  | 145,000,000 |  |  |  |  |
Canadian Revolver Letter of Credit [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Outstanding borrowings or letters of credit issued, short-term | [1] |  |  | $ 5,000,000 |  |  |  |  |
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Facility amount |  | 1,300,000,000 | [2] |  | $ 1,300,000,000 | $ 1,000,000,000 |  |  |
Outstanding borrowings or letters of credit issued, short-term | [2] | 0 |  |  |  |  |  |  |
Availability | [2] | 1,300,000,000 |  |  |  |  |  |  |
Committed Letter of Credit Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Facility amount |  | 50,000,000 |  |  |  |  |  |  |
Outstanding borrowings or letters of credit issued, short-term | [1] | 0 |  |  |  |  |  |  |
Availability |  | 50,000,000 |  |  |  |  |  |  |
DGD Revolver [Member] | Credit Facilities [Member] | Diamond Green Diesel Holdings LLC [Member] | Variable Interest Entities (VIEs) [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Facility amount |  | 400,000,000 | [3] |  |  |  |  |  | $ 400,000,000
Outstanding borrowings or letters of credit issued | [3] | 100,000,000 |  |  |  |  |  |  |
Availability | [3] | 293,000,000 |  |  |  |  |  |  |
DGD Revolver Letter Of Credit [Member] | Credit Facilities [Member] | Diamond Green Diesel Holdings LLC [Member] | Variable Interest Entities (VIEs) [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Facility amount |  | 50,000,000 |  |  |  |  |  |  | $ 10,000,000
Outstanding borrowings or letters of credit issued | [1],[3] | 7,000,000 |  |  |  |  |  |  |
IEnova Revolver [Member] | Credit Facilities [Member] | Central Mexico Terminals [Member] | Variable Interest Entities (VIEs) [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Facility amount |  |  |  |  |  |  | $ 743,000,000 | $ 660,000,000 |
Outstanding borrowings or letters of credit issued, short-term | [3] | 627,000,000 |  |  |  |  |  |  |
IEnova Revolver [Member] | Credit Facilities [Member] | Central Mexico Terminals [Member] | Variable Interest Entities (VIEs) [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Facility amount | [3] | 743,000,000 |  |  |  |  |  |  |
Availability | [3] | 116,000,000 |  |  |  |  |  |  |
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |
Outstanding borrowings or letters of credit issued, short-term | [1] | $ 127,000,000 |  |  |  |  |  |  |
[1] | Letters of credit issued as of September 30, 2021 expire at various times in 2021 through 2023.
[2] | In July 2021, we extended the maturity date of this facility to July 2022 and increased the facility amount from $1.0 billion to $1.3 billion.
[3] | Creditors of our VIEs do not have recourse against us.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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