Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 893	$ 1,356
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	999	956
Lower of cost or market inventory valuation adjustment	0	(747)
Asset impairment loss	0	56
Deferred income tax expense	24	195
Changes in current assets and current liabilities	859	1,130
Changes in deferred charges and credits and other operating activities, net	10	13
Net cash provided by operating activities	2,785	2,959
Cash flows from investing activities:
Capital expenditures	(572)	(610)
Deferred turnaround and catalyst costs	(308)	(325)
Investment in joint venture	(222)	0
Acquisition of undivided interest in crude system assets	(72)	0
Other investing activities, net	0	4
Net cash used in investing activities	(1,174)	(931)
Cash flows from financing activities:
Proceeds from debt issuances or borrowings	0	197
Repayments of debt and capital lease obligations	(11)	(24)
Purchase of common stock for treasury	(660)	(665)
Common stock dividends	(627)	(564)
Proceeds from issuance of Valero Energy Partners LP common units	36	0
Distributions to noncontrolling interests (public unitholders) of Valero Energy Partners LP	(18)	(14)
Distributions to other noncontrolling interests	(27)	(33)
Other financing activities, net	(21)	(134)
Net cash used in financing activities	(1,328)	(1,237)
Effect of foreign exchange rate changes on cash	108	20
Net increase in cash and temporary cash investments	391	811
Cash and temporary cash investments at beginning of period	4,816	4,114
Cash and temporary cash investments at end of period	$ 5,207	$ 4,925