Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 3,353	$ 4,156	$ 2,417
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	2,069	1,986	1,894
Lower of cost or market inventory valuation adjustment	0	0	(747)
Asset impairment loss	0	0	56
Deferred income tax expense (benefit)	203	(2,543)	230
Changes in current assets and current liabilities	(1,297)	1,289	976
Changes in deferred charges and credits and other operating activities, net	43	594	(6)
Net cash provided by operating activities	4,371	5,482	4,820
Cash flows from investing activities:
Deferred turnaround and catalyst costs	(915)	(523)	(718)
Investments in joint ventures	(181)	(406)	(4)
Peru Acquisition, net of cash acquired	(468)	0	0
Acquisitions of undivided interests	(212)	(72)	0
Other investing activities, net	8	(2)	(6)
Net cash used in investing activities	(3,928)	(2,382)	(2,006)
Cash flows from financing activities:
Repayments of debt and capital lease obligations	(1,359)	(21)	(1,475)
Purchases of common stock for treasury	(1,708)	(1,372)	(1,336)
Common stock dividends	(1,369)	(1,242)	(1,111)
Contributions from noncontrolling interests	32	30	0
Distributions to noncontrolling interests	(116)	(67)	(65)
Other financing activities, net	(15)	20	(178)
Net cash used in financing activities	(3,168)	(2,272)	(2,012)
Effect of foreign exchange rate changes on cash	(143)	206	(100)
Net increase (decrease) in cash and cash equivalents	(2,868)	1,034	702
Cash and cash equivalents at beginning of year	5,850	4,816	4,114
Cash and cash equivalents at end of year	2,982	5,850	4,816
Minor Acquisitions [Member]
Cash flows from investing activities:
Asset acquisitions	(88)	0	0
Ethanol Plants [Member]
Cash flows from investing activities:
Asset acquisitions	(320)	0	0
Certain variable interest entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(124)	(26)	0
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	109	0	0
Excluding certain variable interest entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(1,628)	(1,353)	(1,278)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	$ 1,258	$ 380	$ 2,153