Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ (798)	$ 1,454
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	1,774	1,684
LCM inventory valuation adjustment	(19)	0
Deferred income tax expense	177	19
Changes in current assets and current liabilities	(232)	728
Changes in deferred charges and credits and other operating activities, net	(50)	(62)
Net cash provided by operating activities	852	3,823
Cash flows from investing activities:
Investments in unconsolidated joint ventures	(39)	(122)
Acquisitions of undivided interests	0	(65)
Other investing activities, net	16	5
Net cash used in investing activities	(1,852)	(2,190)
Cash flows from financing activities:
Purchases of common stock for treasury	(147)	(555)
Common stock dividends	(1,200)	(1,123)
Acquisition of VLP publicly held common units	0	(950)
Distributions to noncontrolling interests	(208)	(57)
Other financing activities, net	(32)	(23)
Net cash provided by (used in) financing activities	2,470	(2,474)
Effect of foreign exchange rate changes on cash	(6)	(4)
Net increase (decrease) in cash and cash equivalents	1,464	(845)
Cash and cash equivalents at beginning of period	2,583	2,982
Cash and cash equivalents at end of period	4,047	2,137
Excluding Variable Interest Entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(775)	(1,179)
Deferred turnaround and catalyst cost expenditures	(529)	(583)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	4,320	1,892
Repayments of debt and finance lease obligations	(461)	(1,802)
Variable Interest Entities (VIEs) [Member]
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	202	148
Repayments of debt and finance lease obligations	(4)	(4)
Diamond Green Diesel Holdings LLC (DGD) [Member]
Cash flows from investing activities:
Capital expenditures	(311)	(91)
Deferred turnaround and catalyst cost expenditures	(18)	(16)
Other VIEs [Member]
Cash flows from investing activities:
Capital expenditures	$ (196)	$ (139)