Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 178	$ (798)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	1,807	1,774
LCM inventory valuation adjustment	0	(19)
Gain on sale of partial interest in MVP Terminalling, LLC (MVP)	(62)	0
Deferred income tax expense (benefit)	(150)	177
Changes in current assets and current liabilities	1,630	(232)
Changes in deferred charges and credits and other operating activities, net	2	(50)
Net cash provided by operating activities	3,405	852
Cash flows from investing activities:
Proceeds from sale of partial interest in MVP	270	0
Investments in unconsolidated joint ventures	(8)	(39)
Other investing activities, net	33	16
Net cash used in investing activities	(1,412)	(1,852)
Cash flows from financing activities:
Purchases of common stock for treasury	(15)	(147)
Common stock dividend payments	(1,201)	(1,200)
Contributions from noncontrolling interests	25	0
Distributions to noncontrolling interests	(2)	(208)
Other financing activities, net	1	(32)
Net cash provided by (used in) financing activities	(1,739)	2,470
Effect of foreign exchange rate changes on cash	(69)	(6)
Net increase in cash and cash equivalents	185	1,464
Cash and cash equivalents at beginning of period	3,313	2,583
Cash and cash equivalents at end of period	3,498	4,047
Excluding Variable Interest Entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(368)	(775)
Deferred turnaround and catalyst cost expenditures	(544)	(529)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	0	4,320
Repayments of debt and finance lease obligations	(672)	(461)
Variable Interest Entities (VIEs) [Member]
Cash flows from financing activities:
Repayments of debt and finance lease obligations	(4)	(4)
Diamond Green Diesel Holdings LLC (DGD) [Member]
Cash flows from investing activities:
Capital expenditures	(730)	(311)
Deferred turnaround and catalyst cost expenditures	(6)	(18)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	100	0
Other VIEs [Member]
Cash flows from investing activities:
Capital expenditures	(59)	(196)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	$ 29	$ 202