Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt and Capital Lease Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instruments [Abstract]
Net unamortized debt issuance costs and other	$ (73)	$ (79)
Total debt	8,310	7,926
Capital lease obligations	562	75
Total debt and capital lease obligations	8,872	8,001
Less current portion	122	115
Debt and capital lease obligations, less current portion	8,750	7,886
Credit Facilities [Member] \| Valero Revolver [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	0	0
Credit Facilities [Member] \| VLP Revolver [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	410	30
Credit Facilities [Member] \| Canadian Revolver [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	0	0
Credit Facilities [Member] \| Accounts Receivable Sales Facility [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	100	100
Senior Notes [Member] \| Senior Notes Due In June 2037 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 1,500	1,500
Interest rate of notes (percent)	6.625%
Senior Notes [Member] \| Senior Notes Due in 2026 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 1,250	$ 1,250
Interest rate of notes (percent)	3.40%	3.40%
Senior Notes [Member] \| Senior Notes Due In 2020 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 850	$ 850
Interest rate of notes (percent)	6.125%
Senior Notes [Member] \| Senior Notes Due In 2019 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 750	750
Interest rate of notes (percent)	9.375%
Senior Notes [Member] \| Senior Notes Due In 2032 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 750	750
Interest rate of notes (percent)	7.50%
Senior Notes [Member] \| Senior Notes Due in 2045 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 650	650
Interest rate of notes (percent)	4.90%		4.90%
Senior Notes [Member] \| Senior Notes Due in 2025 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 600	600
Interest rate of notes (percent)	3.65%		3.65%
Senior Notes [Member] \| Senior Notes Due In 2039 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 250	250
Interest rate of notes (percent)	10.50%
Senior Notes [Member] \| Senior Notes Due In 2030 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 200	200
Interest rate of notes (percent)	8.75%
Senior Notes [Member] \| Senior Notes Due In 2097 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 100	100
Interest rate of notes (percent)	7.45%
Senior Notes [Member] \| Senior Notes Due In 2037 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 24	24
Interest rate of notes (percent)	6.75%
Senior Notes [Member] \| VLP Senior Notes Due in 2026 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 500	$ 500
Interest rate of notes (percent)	4.375%	4.375%
Revenue Bonds [Member] \| Gulf Opportunity Zone Revenue Bonds Series 2010 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 300	$ 300
Interest rate of notes (percent)	4.00%
Debentures [Member] \| Debenture Due In 2026 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 100	100
Interest rate of notes (percent)	7.65%
Secured Debt [Member] \| Senior Secured Credit Agreement Due in 2023 [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 49	$ 51