Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (330)	$ (419)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	1,166	1,160
LCM inventory valuation adjustment	0	294
Gain on sale of partial interest in MVP Terminalling, LLC (MVP)	(62)	0
Deferred income tax expense (benefit)	(136)	223
Changes in current assets and current liabilities	1,251	(478)
Changes in deferred charges and credits and other operating activities, net	67	(93)
Net cash provided by operating activities	1,956	687
Cash flows from investing activities:
Proceeds from sale of partial interest in MVP	270	0
Investments in unconsolidated joint ventures	(9)	(29)
Other investing activities, net	24	12
Net cash used in investing activities	(836)	(1,339)
Cash flows from financing activities:
Purchases of common stock for treasury	(15)	(147)
Common stock dividend payments	(801)	(801)
Distributions to noncontrolling interests	(2)	(127)
Other financing activities, net	2	(17)
Net cash provided by (used in) financing activities	(866)	435
Effect of foreign exchange rate changes on cash	5	(47)
Net increase (decrease) in cash and cash equivalents	259	(264)
Cash and cash equivalents at beginning of period	3,313	2,583
Cash and cash equivalents at end of period	3,572	2,319
Excluding Variable Interest Entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(261)	(555)
Deferred turnaround and catalyst cost expenditures	(426)	(437)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	0	1,799
Repayments of debt and finance lease obligations	(63)	(432)
Variable Interest Entities (VIEs) [Member]
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	16	163
Repayments of debt and finance lease obligations	(3)	(3)
Diamond Green Diesel Holdings LLC (DGD) [Member]
Cash flows from investing activities:
Capital expenditures	(398)	(177)
Deferred turnaround and catalyst cost expenditures	(1)	(10)
Other VIEs [Member]
Cash flows from investing activities:
Capital expenditures	$ (35)	$ (143)