Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 968	$ 836
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	441	421
Deferred income tax expense (benefit)	(61)	88
Changes in current assets and current liabilities	57	(1,088)
Changes in deferred charges and credits and other operating activities, net	28	(13)
Net cash provided by operating activities	1,433	244
Cash flows from investing activities:
Capital expenditures	(458)	(388)
Deferred turnaround and catalyst costs	(240)	(129)
Other investing activities, net	(15)	(41)
Net cash used in investing activities	(713)	(558)
Cash flows from financing activities:
Proceeds from debt issuances	1,446	0
Repayment of debt	(402)	0
Proceeds from the exercise of stock options	15	24
Purchase of common stock for treasury	(325)	(226)
Common stock dividends	(206)	(133)
Distributions to public unitholders of Valero Energy Partners LP	(5)	(1)
Other financing activities, net	3	24
Net cash provided by (used in) financing activities	526	(312)
Effect of foreign exchange rate changes on cash	(65)	(19)
Net increase (decrease) in cash and temporary cash investments	1,181	(645)
Cash and temporary cash investments at beginning of period	3,689	4,292
Cash and temporary cash investments at end of period	$ 4,870	$ 3,647