Equity, Stock Related Disclosures (Details) - USD ($)			12 Months Ended
	Jan. 23, 2018	Nov. 24, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 21, 2016	Sep. 16, 2016	Jul. 13, 2015	Feb. 28, 2008
Share Activity Rollforward
Treasury stock, beginning balance (shares)			(222,000,024)
Treasury stock, ending balance (shares)			(239,603,534)	(222,000,024)
Equity (Textual)
Preferred stock authorized (shares)			20,000,000
Preferred stock par value per share (in dollars per share)			$ 0.01
Preferred stock outstanding (shares)			0	0
Stock repurchases under buyback program			$ 1,307,000,000	$ 1,262,000,000	$ 2,667,000,000
Remaining amount authorized under stock purchase programs			1,200,000,000
Proceeds from issuance of Valero Energy Partners LP common units			$ 36,000,000	$ 10,000,000	189,000,000
Public Offering [Member] | Valero Energy Partners LP [Member]
Equity (Textual)
Aggregate offering price under equity distribution agreement							$ 350,000,000
Units sold in the offering (shares)		4,250,000	742,897	223,083
Proceeds from issuance of Valero Energy Partners LP common units		$ 189,000,000	$ 35,000,000	$ 9,000,000
Price per unit (in dollars per unit)		$ 46.25
Subsequent Event [Member] | Dividend Declared [Member]
Equity (Textual)
Dividends payable, date declared	Jan. 23, 2018
Dividends payable (in dollars per share)	$ 0.80
Dividends payable, date to be paid	Mar. 06, 2018
Dividends payable, date of record	Feb. 13, 2018
Common Stock Repurchase Programs [Member]
Equity (Textual)
Stock repurchases under buyback program			$ 1,300,000,000	$ 1,300,000,000	$ 2,700,000,000
$3 Billion Program Approved February 2008 [Member]
Equity (Textual)
Authorized amount under stock purchase program									$ 3,000,000,000
Stock Repurchase Program Approved July 2015 [Member]
Equity (Textual)
Authorized amount under stock purchase program								$ 2,500,000,000
Stock Repurchase Program Approved September 2016 [Member]
Equity (Textual)
Authorized amount under stock purchase program						$ 2,500,000,000
Stock Repurchase Program Approved January 2018 [Member] | Subsequent Event [Member]
Equity (Textual)
Authorized amount under stock purchase program	$ 2,500,000,000
Common Stock [Member]
Share Activity Rollforward
Common stock, beginning balance (shares)			673,000,000	673,000,000	673,000,000
Common stock, ending balance (shares)			673,000,000	673,000,000	673,000,000
Treasury Stock [Member]
Share Activity Rollforward
Treasury stock, beginning balance (shares)			(222,000,000)	(200,000,000)	(159,000,000)
Transactions in connection with stock-based compensation plans (shares)			1,000,000	1,000,000	1,000,000
Stock purchases under purchase program (shares)			(19,000,000)	(23,000,000)	(42,000,000)
Treasury stock, ending balance (shares)			(240,000,000)	(222,000,000)	(200,000,000)
Equity (Textual)
Stock repurchases under buyback program			$ 1,307,000,000	$ 1,262,000,000	$ 2,667,000,000