Equity (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
		Nov. 01, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period					$ 20,854	$ 21,354
Net income			$ 863	$ 645	1,756	2,001
Dividends					(936)	(840)
Stock-based compensation expense					37	33
Distributions to noncontrolling interests					(56)	(54)
Other					(30)	(21)
Other comprehensive income (loss)			231	(118)	518	(186)
Balance as of end of period			21,224	21,130	21,224	21,130
Dividend Declared [Member] | Subsequent Event [Member]
Equity (Textual)
Dividends payable, date declared		Nov. 01, 2017
Dividends payable, amount per share (in dollars per share)		$ 0.70
Dividends payable, date to be paid		Dec. 12, 2017
Dividends payable, date of record		Nov. 21, 2017
Valero Energy Partners LP [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Issuance of Valero Energy Partners LP common units					33	6
Stock-Based Compensation Plans Purchase Program [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Stock purchases					(27)	(43)
Common Stock Purchase Program [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Stock purchases					(925)	(1,120)
Parent [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period					20,024	20,527
Net income					1,694	1,922
Dividends					(936)	(840)
Stock-based compensation expense					37	33
Distributions to noncontrolling interests					0	0
Other					(14)	47
Other comprehensive income (loss)					517	(187)
Balance as of end of period			20,370	20,339	20,370	20,339
Parent [Member] | Valero Energy Partners LP [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Issuance of Valero Energy Partners LP common units					0	0
Parent [Member] | Stock-Based Compensation Plans Purchase Program [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Stock purchases					(27)	(43)
Parent [Member] | Common Stock Purchase Program [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Stock purchases					(925)	(1,120)
Noncontrolling Interests [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Balance as of beginning of period	[1]				830	827
Net income	[1]				62	79
Distributions to noncontrolling interests	[1]				(56)	(54)
Other	[1]				(16)	(68)
Other comprehensive income (loss)	[1]				1	1
Balance as of end of period	[1]		$ 854	$ 791	854	791
Noncontrolling Interests [Member] | Valero Energy Partners LP [Member]
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity
Issuance of Valero Energy Partners LP common units	[1]				$ 33	$ 6

[1] The noncontrolling interests relate to third-party ownership interests in VIEs for which we are the primary beneficiary and therefore consolidate. See Note 7 for information about our consolidated VIEs.