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Debt and Capital Lease Obligations, Narrative (Details) - USD ($)		6 Months Ended
		Jun. 30, 2018	Dec. 31, 2017
Peru Acquisition [Member]
Credit Facilities (Textual)
Amount of debt retired		$ 137,000,000
Senior Notes [Member] | Senior Notes Due June 2028 [Member]
Credit Facilities (Textual)
Face amount of long-term debt issuance		$ 750,000,000
Stated rate on debt instrument (percent)		4.35%
Maturity date of long-term debt		Jun. 01, 2028
Proceeds from issuance of senior long-term debt		$ 749,000,000
Debt issuance costs		$ 7,000,000
Senior Notes [Member] | Senior Notes Due March 2019 [Member]
Credit Facilities (Textual)
Stated rate on debt instrument (percent)		9.375%
Maturity date of long-term debt		Mar. 15, 2019
Early repayment of senior debt		$ 787,000,000
Early redemption fee		37,000,000
Senior Notes [Member] | VLP Senior Notes Due March 2028 [Member] | Valero Energy Partners LP [Member]
Credit Facilities (Textual)
Face amount of long-term debt issuance		$ 500,000,000
Stated rate on debt instrument (percent)		4.50%
Maturity date of long-term debt		Mar. 15, 2028
Proceeds from issuance of senior long-term debt		$ 498,000,000
Debt issuance costs		5,000,000
Credit Facilities [Member] | A/R Sales Facility [Member]
Credit Facilities (Textual)
Line of credit facility, maximum borrowing capacity	[1]	$ 1,300,000,000
Maturity date of credit facility	[1]	Jul. 31, 2018
Variable interest rate (percent)		2.7009%	2.0387%
Credit Facilities [Member] | Valero Energy Partners LP [Member] | VLP Revolver [Member]
Credit Facilities (Textual)
Line of credit facility, maximum borrowing capacity		$ 750,000,000
Maturity date of credit facility		Nov. 30, 2020
Credit Facilities [Member] | Central Mexico Terminals [Member] | IEnova Revolver [Member]
Credit Facilities (Textual)
Line of credit facility, maximum borrowing capacity		$ 340,000,000
Outstanding borrowings on amounts reflected in current portion of debt		56,000,000
Repayments on lines of credit		$ 0
Maturity date of credit facility		Feb. 28, 2028
Variable interest rate (percent)		5.958%
Credit Facilities [Member] | VLP Revolver [Member] | Valero Energy Partners LP [Member]
Credit Facilities (Textual)
Repayments of outstanding amounts under the VLP revolver		$ 410,000,000
Subordinated Debt [Member] | VLP Subordinated Notes [Member] | Valero Energy Partners LP [Member]
Credit Facilities (Textual)
Repayments of notes payable-related party		$ 85,000,000
[1] In July 2018, we amended this facility to extend the maturity date from July 2018 to July 2019.

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Face (par) amount of debt instrument at time of issuance.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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