Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 1,454	$ 2,331
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	1,684	1,538
Deferred income tax expense (benefit)	19	(62)
Changes in current assets and current liabilities	728	(1,174)
Changes in deferred charges and credits and other operating activities, net	(62)	60
Net cash provided by operating activities	3,823	2,693
Cash flows from investing activities:
Investments in unconsolidated joint ventures	(122)	(124)
Peru Acquisition, net of cash acquired	0	(466)
Acquisitions of undivided interests	(65)	(181)
Other investing activities, net	5	9
Net cash provided by (used in) investing activities	(2,190)	(2,768)
Cash flows from financing activities:
Purchases of common stock for treasury	(555)	(1,081)
Common stock dividends	(1,123)	(1,031)
Acquisition of Valero Energy Partners LP publicly held common units	(950)	0
Contributions from noncontrolling interests	0	32
Distributions to noncontrolling interests	(57)	(63)
Other financing activities, net	(29)	(15)
Net cash used in financing activities	(2,474)	(2,181)
Effect of foreign exchange rate changes on cash	(4)	(43)
Net increase (decrease) in cash and cash equivalents	(845)	(2,299)
Cash and cash equivalents at beginning of period	2,982	5,850
Cash and cash equivalents at end of period	2,137	3,551
Minor Acquisitions [Member]
Cash flows from investing activities:
Minor acquisitions	0	(88)
Variable Interest Entities (VIEs) [Member]
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	148	71
Repayments of debt and finance lease obligations	(4)	(4)
Diamond Green Diesel Holdings LLC (DGD) [Member]
Cash flows from investing activities:
Capital expenditures	(91)	(143)
Deferred turnaround and catalyst cost expenditures	(16)	(20)
Other VIEs [Member]
Cash flows from investing activities:
Capital expenditures	(139)	(89)
Excluding Variable Interest Entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(1,179)	(1,025)
Deferred turnaround and catalyst cost expenditures	(583)	(641)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	1,892	1,258
Repayments of debt and finance lease obligations	$ (1,796)	$ (1,348)