Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (622)	$ (1,754)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	578	582
LCM inventory valuation adjustment	0	2,542
Deferred income tax benefit	(239)	(162)
Changes in current assets and current liabilities	184	(1,107)
Changes in deferred charges and credits and other operating activities, net	47	(150)
Net cash used in operating activities	(52)	(49)
Cash flows from investing activities:
Investments in unconsolidated joint ventures	(12)	(19)
Other investing activities, net	2	10
Net cash used in investing activities	(580)	(757)
Cash flows from financing activities:
Purchases of common stock for treasury	(14)	(147)
Common stock dividend payments	(400)	(401)
Other financing activities, net	(1)	(1)
Net cash used in financing activities	(439)	(195)
Effect of foreign exchange rate changes on cash	12	(67)
Net decrease in cash and cash equivalents	(1,059)	(1,068)
Cash and cash equivalents at beginning of period	3,313	2,583
Cash and cash equivalents at end of period	2,254	1,515
Excluding Variable Interest Entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(160)	(299)
Deferred turnaround and catalyst cost expenditures	(230)	(309)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	0	300
Repayments of debt and finance lease obligations	(31)	(15)
Variable Interest Entities (VIEs) [Member]
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	8	70
Repayments of debt and finance lease obligations	(1)	(1)
Diamond Green Diesel Holdings LLC (DGD) [Member]
Cash flows from investing activities:
Capital expenditures	(153)	(74)
Deferred turnaround and catalyst cost expenditures	(1)	(4)
Other VIEs [Member]
Cash flows from investing activities:
Capital expenditures	$ (26)	$ (62)