Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 321	$ 513
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	500	485
Lower of cost or market inventory valuation adjustment	0	(293)
Deferred income tax expense (benefit)	(4)	121
Changes in current assets and current liabilities	151	(177)
Changes in deferred charges and credits and other operating activities, net	20	(9)
Net cash provided by operating activities	988	640
Cash flows from investing activities:
Capital expenditures	(279)	(316)
Deferred turnaround and catalyst costs	(245)	(161)
Investments in joint ventures	(117)	(2)
Acquisition of undivided interest in crude system assets	(72)	0
Other investing activities, net	(1)	(2)
Net cash used in investing activities	(714)	(481)
Cash flows from financing activities:
Repayments of debt and capital lease obligations	(5)	(3)
Purchase of common stock for treasury	(314)	(265)
Common stock dividends	(315)	(282)
Proceeds from issuance of Valero Energy Partners LP common units	35	0
Distributions to noncontrolling interests (public unitholders) of Valero Energy Partners LP	(9)	(7)
Distributions to other noncontrolling interests	(25)	0
Other financing activities, net	(19)	13
Net cash used in financing activities	(652)	(544)
Effect of foreign exchange rate changes on cash	25	49
Net decrease in cash and temporary cash investments	(353)	(336)
Cash and temporary cash investments at beginning of period	4,816	4,114
Cash and temporary cash investments at end of period	$ 4,463	$ 3,778