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Debt, Credit Facilities (Details) | Nov. 07, 2019 USD ($) | Sep. 30, 2019 CAD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Valero Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Facility amount |  |  |  | $ 4,000,000,000 | $ 4,000,000,000 | $ 3,000,000,000
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 |  |  |  |  |  |
Facility amount |  |  |  |  | $ 2,400,000,000 |
Outstanding borrowings or letters of credit issued | [1] |  |  | 34,000,000 |  |
Canadian Revolver [Member] | Credit Facilities [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Facility amount | [2] |  | $ 150,000,000 |  |  |
Outstanding borrowings, short-term | [2] |  | 0 |  |  |
Availability | [2] |  | 145,000,000 |  |  |
Canadian Revolver Letter of Credit [Member] | Credit Facilities [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Outstanding borrowings, short-term | [1],[2] |  | $ 5,000,000 |  |  |
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Facility amount |  |  |  | 1,300,000,000 |  |
Outstanding borrowings, short-term |  |  |  | 100,000,000 |  |
Availability |  |  |  | 1,200,000,000 |  |
Committed Letter of Credit Facility Expires November 2019 [Member] | Credit Facilities [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Facility amount | [3] |  |  | 100,000,000 |  |
Outstanding borrowings, short-term | [1],[3] |  |  | 0 |  |
Availability | [3] |  |  | 100,000,000 |  |
Committed Letter of Credit Facility Expires November 2019 [Member] | Credit Facilities [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Facility amount |  |  |  | 100,000,000 |  |
Committed Letter of Credit Facility Expires November 2019 [Member] | Credit Facilities [Member] | Subsequent Event [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Facility amount |  | $ 50,000,000 |  |  |  |
IEnova Revolver [Member] | Central Mexico Terminals [Member] | Credit Facilities [Member] | Variable Interest Entities (VIEs) [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Facility amount | [4] |  |  | 340,000,000 |  |
Outstanding borrowings or letters of credit issued | [4] |  |  | 257,000,000 |  |
Availability | [4] |  |  | 83,000,000 |  |
Uncommitted Letter of Credit Facility [Member] | Credit Facilities [Member] |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Outstanding borrowings, short-term | [1] |  |  | $ 129,000,000 |  |
[1] | Letters of credit issued as of September 30, 2019 expire at various times in 2019 through 2020.
[2] | The Canadian Revolver was amended in November 2019 to extend the maturity date from November 2019 to November 2020.
[3] | The letter of credit facility was amended in November 2019 to reduce the facility from $100 million to $50 million and to extend the maturity date from November 2019 to November 2020.
[4] | 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=6877327&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=6876686&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=119400593&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=6877327&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=6877327&loc=d3e13212-122682 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + 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)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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