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Debt, Credit Facilities (Details) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 CAD ($) | Jul. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Apr. 13, 2020 USD ($) | Dec. 31, 2019 USD ($)
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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 |  | 3,966,000,000 |  |  |  |  |  |
Valero Revolver Letter of Credit [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Outstanding borrowings or letters of credit issued | [1] | 34,000,000 |  |  |  |  |  |
364-Day Revolving Credit Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Facility amount |  | 875,000,000 |  |  |  |  | $ 875,000,000 |
Outstanding borrowings or letters of credit issued, short-term |  | 0 |  |  |  |  |  |
Availability |  | 875,000,000 |  |  |  |  |  |
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 |  | 1,000,000,000 | [2] |  | $ 1,000,000,000.0 | $ 1,300,000,000 |  |
Outstanding borrowings or letters of credit issued, short-term |  | 0 | [2] |  |  |  |  | $ 100,000,000
Availability | [2] | 817,000,000 |  |  |  |  |  |
Committed Letter of Credit Facility Expires November 2020 [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 |  |  |  |  |  |
IEnova Revolver [Member] | Central Mexico Terminals [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Facility amount |  | 660,000,000 |  |  |  |  |  | 491,000,000
Outstanding borrowings or letters of credit issued, short-term |  | 550,000,000 |  |  |  |  |  | $ 348,000,000
IEnova Revolver [Member] | Central Mexico Terminals [Member] | Credit Facilities [Member] | Variable Interest Entities (VIEs) [Member] |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Facility amount | [3] | 660,000,000 |  |  |  |  |  |
Outstanding borrowings or letters of credit issued, short-term | [3] | 550,000,000 |  |  |  |  |  |
Availability | [3] | 110,000,000 |  |  |  |  |  |
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Outstanding borrowings or letters of credit issued, short-term | [1] | $ 46,000,000 |  |  |  |  |  |
[1] | Letters of credit issued as of September 30, 2020 expire at various times in 2020 through 2023.
[2] | In July 2020, we extended the maturity date of this facility to July 2021 and decreased the facility amount from $1.3 billion to $1.0 billion. The available borrowing capacity was lower than the facility amount due to low product prices impacting the amount of eligible receivables.
[3] | Creditors of our VIE 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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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