Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 7,931	$ 8,647
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	2,011	1,840
Loss (gain) on early retirement of debt, net	(11)	24
Deferred income tax expense (benefit)	32	(161)
Changes in current assets and current liabilities	(1,695)	(1,617)
Changes in deferred charges and credits and other operating activities, net	(278)	(255)
Net cash provided by operating activities	7,990	8,478
Cash flows from investing activities:
Purchases of available-for-sale (AFS) debt securities	(237)	0
Proceeds from sales and maturities of AFS debt securities	220	0
Proceeds from sale of assets	0	32
Investments in nonconsolidated joint ventures	0	(1)
Other investing activities, net	11	(4)
Net cash used in investing activities	(1,382)	(2,070)
Cash flows from financing activities:
Premiums paid on early retirement of debt	(5)	(48)
Purchases of common stock for treasury	(4,180)	(2,769)
Common stock dividend payments	(1,106)	(1,186)
Contributions from noncontrolling interests	75	240
Distributions to noncontrolling interests	(164)	(93)
Other financing activities, net	3	(6)
Net cash used in financing activities	(5,645)	(6,269)
Effect of foreign exchange rate changes on cash	6	(292)
Net increase (decrease) in cash and cash equivalents	969	(153)
Cash and cash equivalents at beginning of period	4,862	4,122
Cash and cash equivalents at end of period	5,831	3,969
Excluding Variable Interest Entities (VIEs) [Member]
Cash flows from investing activities:
Capital expenditures	(468)	(552)
Deferred turnaround and catalyst cost expenditures	(665)	(820)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	1,750	1,839
Repayments of debt and finance lease obligations	(2,071)	(4,234)
Diamond Green Diesel Holdings LLC (DGD) [Member]
Cash flows from investing activities:
Capital expenditures	(183)	(682)
Deferred turnaround and catalyst cost expenditures	(56)	(13)
Cash flows from financing activities:
Proceeds from debt issuances and borrowings	500	684
Repayments of debt and finance lease obligations	(474)	(718)
Other VIEs [Member]
Cash flows from investing activities:
Capital expenditures	(4)	(30)
Cash flows from financing activities:
Proceeds from borrowings of other VIEs	86	73
Repayments of debt and finance lease obligations	$ (59)	$ (51)