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Debt and Capital Lease Obligations, Credit Facilities (Details)		1 Months Ended	6 Months Ended
		Jul. 31, 2018	Jun. 30, 2018 CAD ($)	Jun. 30, 2018 USD ($)
Uncommitted Letter of Credit Facility [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued				$ 301,000,000
Credit Facilities [Member] | Valero Revolver [Member]
Line of Credit Facility
Facility amount				3,000,000,000
Maturity date			Nov. 30, 2020
Outstanding borrowings or letters of credit issued				0
Availability				2,881,000,000
Credit Facilities [Member] | Valero Revolver Letter of Credit [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued				119,000,000
Credit Facilities [Member] | VLP Revolver [Member] | Valero Energy Partners LP [Member]
Line of Credit Facility
Facility amount				750,000,000
Maturity date			Nov. 30, 2020
Outstanding borrowings or letters of credit issued				0
Availability				750,000,000
Credit Facilities [Member] | VLP Revolver Letter of Credit [Member] | Valero Energy Partners LP [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued				0
Credit Facilities [Member] | IEnova Revolver [Member] | Central Mexico Terminals [Member]
Line of Credit Facility
Facility amount				340,000,000
Maturity date			Feb. 28, 2028
Outstanding borrowings				56,000,000
Availability				284,000,000
Credit Facilities [Member] | Canadian Revolver [Member]
Line of Credit Facility
Facility amount			$ 75,000,000
Maturity date			Nov. 30, 2018
Outstanding borrowings or letters of credit issued			$ 0
Availability			69,000,000
Credit Facilities [Member] | Canadian Revolver Letter of Credit [Member]
Line of Credit Facility
Outstanding borrowings or letters of credit issued			$ 6,000,000
Credit Facilities [Member] | A/R Sales Facility [Member]
Line of Credit Facility
Facility amount	[1]			1,300,000,000
Maturity date	[1]		Jul. 31, 2018
Outstanding borrowings or letters of credit issued	[1]			100,000,000
Availability	[1]			1,200,000,000
Credit Facilities [Member] | A/R Sales Facility [Member] | Subsequent Event [Member]
Line of Credit Facility
Maturity date	[1]	Jul. 31, 2019
Credit Facilities [Member] | Committed Letter of Credit Facility Expires November 2018 [Member]
Line of Credit Facility
Facility amount				100,000,000
Maturity date			Nov. 30, 2018
Outstanding borrowings or letters of credit issued				0
Availability				$ 100,000,000
[1] In July 2018, we amended this facility to extend the maturity date from July 2018 to July 2019.

X

- 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=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ 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

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Balance Type:	na
Period Type:	duration

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The carrying value as of the balance sheet date of the current portion 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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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