Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ (419)	$ 815
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	1,160	1,117
LCM inventory valuation adjustment	294	0
Deferred income tax expense (benefit)	223	(12)
Changes in current assets and current liabilities	(478)	413
Changes in deferred charges and credits and other operating activities, net	(93)	61
Net cash provided by operating activities	687	2,394
Cash flows from investing activities:
Investments in unconsolidated joint ventures	(29)	(90)
Acquisitions of undivided interests	0	(29)
Other investing activities, net	12	9
Net cash used in investing activities	(1,339)	(1,555)
Cash flows from financing activities:
Purchases of common stock for treasury	(147)	(248)
Common stock dividends	(801)	(751)
Acquisition of VLP publicly held common units	0	(950)
Distributions to noncontrolling interests	(127)	(18)
Other financing activities, net	(17)	(25)
Net cash provided by (used in) financing activities	435	(1,825)
Effect of foreign exchange rate changes on cash	(47)	37
Net decrease in cash and cash equivalents	(264)	(949)
Cash and cash equivalents at beginning of period	2,583	2,982
Cash and cash equivalents at end of period	2,319	2,033
Excluding Variable Interest Entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(555)	(854)
Deferred turnaround and catalyst cost expenditures	(437)	(470)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	1,799	1,892
Repayments of debt and finance lease obligations	(432)	(1,792)
Variable Interest Entities (VIEs) [Member]
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	163	70
Repayments of debt and finance lease obligations	(3)	(3)
Diamond Green Diesel Holdings LLC (DGD) [Member]
Cash flows from investing activities:
Capital expenditures	(177)	(51)
Deferred turnaround and catalyst cost expenditures	(10)	(1)
Other VIEs [Member]
Cash flows from investing activities:
Capital expenditures	$ (143)	$ (69)