Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (1,107)	$ 2,784	$ 3,353
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	2,351	2,255	2,069
LCM inventory valuation adjustment	(19)	0	0
Deferred income tax expense	158	234	203
Changes in current assets and current liabilities	(345)	294	(1,297)
Changes in deferred charges and credits and other operating activities, net	(90)	(36)	43
Net cash provided by operating activities	948	5,531	4,371
Cash flows from investing activities:
Investments in unconsolidated joint ventures	(54)	(164)	(181)
Peru Acquisition, net of cash acquired	0	0	(468)
Acquisitions of undivided interests	0	(72)	(212)
Other investing activities, net	65	12	8
Net cash used in investing activities	(2,425)	(3,001)	(3,928)
Cash flows from financing activities:
Purchases of common stock for treasury	(156)	(777)	(1,708)
Common stock dividend payments	(1,600)	(1,492)	(1,369)
Acquisition of VLP publicly held common units	0	(950)	0
Contributions from noncontrolling interests	0	0	32
Distributions to noncontrolling interests	(208)	(70)	(116)
Other financing activities, net	(34)	(22)	(2)
Net cash provided by (used in) financing activities	2,077	(2,997)	(3,168)
Effect of foreign exchange rate changes on cash	130	68	(143)
Net increase (decrease) in cash and cash equivalents	730	(399)	(2,868)
Cash and cash equivalents at beginning of year	2,583	2,982	5,850
Cash and cash equivalents at end of year	3,313	2,583	2,982
Minor Acquisitions [Member]
Cash flows from investing activities:
Asset acquisitions	0	0	(88)
Ethanol Plants [Member]
Cash flows from investing activities:
Asset acquisitions	0	(3)	(320)
Excluding Variable Interest Entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(1,014)	(1,627)	(1,463)
Deferred turnaround and catalyst cost expenditures	(623)	(762)	(888)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	4,320	1,892	1,258
Repayments of debt and finance lease obligations	(490)	(1,811)	(1,366)
Variable Interest Entities (VIEs) [Member]
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	250	239	109
Repayments of debt and finance lease obligations	(5)	(6)	(6)
Diamond Green Diesel Holdings LLC (DGD) [Member]
Cash flows from investing activities:
Capital expenditures	(523)	(142)	(165)
Deferred turnaround and catalyst cost expenditures	(25)	(18)	(27)
Other VIEs [Member]
Cash flows from investing activities:
Capital expenditures	$ (251)	$ (225)	$ (124)