Disclosures About Segments And Related Information (Schedule Of Segments And Related Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 349,585	$ 344,582	$ 413,680
Crude oil and product purchases	199,454	193,029	228,959
Depreciation and depletion (includes impairments)	23,442	20,641	24,040
Interest expense	996	849	798
Other taxes and duties	26,288	29,011	27,919
Total costs and other deductions	300,712	291,799	335,927
Segment income (loss) before income taxes	48,873	52,783	77,753
Income tax expense (benefit)	13,810	15,429	20,176
Net income (loss) including noncontrolling interests	35,063	37,354	57,577
Net income (loss) attributable to noncontrolling interests	1,383	1,344	1,837
Net income (loss) attributable to ExxonMobil	33,680	36,010	55,740
Additions to property, plant and equipment	109,332	29,038	18,338
Investments in equity companies	34,010	34,080	34,522
Total Assets	453,475	376,317	369,067
Operating Segments
Segment Reporting Information [Line Items]
Total revenues	478,091	469,369	568,344
Crude oil and product purchases	326,773	317,100	382,418
Operating expenses, excl. depreciation and depletion	50,922	48,204	54,219
Depreciation and depletion (includes impairments)	22,390	19,788	23,067
Interest expense	291	173	99
Other taxes and duties	26,542	29,011	27,919
Total costs and other deductions	426,918	414,276	487,722
Segment income (loss) before income taxes	51,173	55,093	80,622
Income tax expense (benefit)	14,690	15,891	21,338
Net income (loss) including noncontrolling interests	36,483	39,202	59,284
Net income (loss) attributable to noncontrolling interests	1,431	1,401	1,881
Net income (loss) attributable to ExxonMobil	35,052	37,801	57,403
Additions to property, plant and equipment	107,151	23,976	17,441
Investments in equity companies	34,118	34,200	34,635
Total Assets	411,124	326,500	324,396
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting Information [Line Items]
Total revenues	1,853	1,664	659
Net income (loss) attributable to ExxonMobil	(1,372)	(1,791)	(1,663)
Additions to property, plant and equipment	2,181	5,062	897
Investments in equity companies	(108)	(120)	(113)
Total Assets	42,351	49,817	44,671
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(130,359)	(126,451)	(155,323)
Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	339,247	334,697	398,675
Sales and other operating revenue | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	339,136	334,629	398,639
Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	6,194	6,385	11,463
Income from equity affiliates | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	6,399	6,746	11,831
Other income
Segment Reporting Information [Line Items]
Total revenues	4,144	3,500	3,542
Other income | Operating Segments
Segment Reporting Information [Line Items]
Total revenues	2,197	1,543	2,551
Other Revenue, Interest | Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting Information [Line Items]
Total revenues	1,600	1,628	446
United States
Segment Reporting Information [Line Items]
Other taxes and duties	3,849	3,871	4,087
Income tax expense (benefit)	2,382	2,837	5,644
United States | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	138,657	127,374	149,225
Non-U.S.
Segment Reporting Information [Line Items]
Other taxes and duties	22,439	25,140	23,832
Income tax expense (benefit)	11,428	12,592	14,532
Non-U.S. | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	200,590	207,323	249,450
Upstream | United States
Segment Reporting Information [Line Items]
Total revenues	48,416	31,165	41,097
Crude oil and product purchases	18,325	9,945	12,786
Operating expenses, excl. depreciation and depletion	9,822	6,696	6,693
Depreciation and depletion (includes impairments)	11,510	8,863	5,791
Interest expense	185	82	51
Other taxes and duties	334	361	718
Total costs and other deductions	40,176	25,947	26,039
Segment income (loss) before income taxes	8,240	5,218	15,058
Income tax expense (benefit)	1,814	1,016	3,330
Net income (loss) including noncontrolling interests	6,426	4,202	11,728
Net income (loss) attributable to noncontrolling interests	0	0	0
Net income (loss) attributable to ExxonMobil	6,426	4,202	11,728
Additions to property, plant and equipment	94,649	10,372	5,940
Investments in equity companies	4,884	4,436	4,893
Total Assets	154,914	67,452	66,695
Upstream | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(24,633)	(20,971)	(25,658)
Upstream | United States | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	22,929	9,500	14,579
Upstream | United States | Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	(36)	63	411
Upstream | United States | Other income
Segment Reporting Information [Line Items]
Total revenues	890	631	449
Upstream | Non-U.S.
Segment Reporting Information [Line Items]
Total revenues	62,330	61,072	88,298
Crude oil and product purchases	10,388	11,279	20,770
Operating expenses, excl. depreciation and depletion	10,695	10,960	12,723
Depreciation and depletion (includes impairments)	8,014	7,737	14,013
Interest expense	82	74	38
Other taxes and duties	2,750	2,684	3,559
Total costs and other deductions	31,929	32,734	51,103
Segment income (loss) before income taxes	30,401	28,338	37,195
Income tax expense (benefit)	10,622	10,593	11,575
Net income (loss) including noncontrolling interests	19,779	17,745	25,620
Net income (loss) attributable to noncontrolling interests	815	639	869
Net income (loss) attributable to ExxonMobil	18,964	17,106	24,751
Additions to property, plant and equipment	8,371	8,217	6,441
Investments in equity companies	21,396	21,485	21,502
Total Assets	134,609	138,914	139,764
Upstream | Non-U.S. | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(41,809)	(38,982)	(46,076)
Upstream | Non-U.S. | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	14,202	16,074	30,585
Upstream | Non-U.S. | Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	5,649	5,550	10,133
Upstream | Non-U.S. | Other income
Segment Reporting Information [Line Items]
Total revenues	670	466	1,504
Energy Products | United States
Segment Reporting Information [Line Items]
Total revenues	125,386	127,672	147,135
Crude oil and product purchases	110,205	107,796	123,675
Operating expenses, excl. depreciation and depletion	8,034	7,851	8,373
Depreciation and depletion (includes impairments)	799	765	741
Interest expense	9	4	1
Other taxes and duties	3,421	3,421	3,306
Total costs and other deductions	122,468	119,837	136,096
Segment income (loss) before income taxes	2,918	7,835	11,039
Income tax expense (benefit)	631	1,543	2,615
Net income (loss) including noncontrolling interests	2,287	6,292	8,424
Net income (loss) attributable to noncontrolling interests	188	169	84
Net income (loss) attributable to ExxonMobil	2,099	6,123	8,340
Additions to property, plant and equipment	589	1,106	1,141
Investments in equity companies	444	406	368
Total Assets	32,143	32,123	31,729
Energy Products | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(23,626)	(23,481)	(29,001)
Energy Products | United States | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	101,325	103,868	117,824
Energy Products | United States | Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	140	140	126
Energy Products | United States | Other income
Segment Reporting Information [Line Items]
Total revenues	295	183	184
Energy Products | Non-U.S.
Segment Reporting Information [Line Items]
Total revenues	185,648	192,991	225,577
Crude oil and product purchases	153,811	152,487	182,293
Operating expenses, excl. depreciation and depletion	8,924	9,434	12,092
Depreciation and depletion (includes impairments)	734	797	1,246
Interest expense	10	7	7
Other taxes and duties	19,699	22,226	20,040
Total costs and other deductions	183,178	184,951	215,678
Segment income (loss) before income taxes	2,470	8,040	9,899
Income tax expense (benefit)	164	1,492	2,420
Net income (loss) including noncontrolling interests	2,306	6,548	7,479
Net income (loss) attributable to noncontrolling interests	372	529	853
Net income (loss) attributable to ExxonMobil	1,934	6,019	6,626
Additions to property, plant and equipment	1,450	1,455	964
Investments in equity companies	915	1,135	1,154
Total Assets	43,399	42,337	41,836
Energy Products | Non-U.S. | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(26,034)	(28,258)	(36,894)
Energy Products | Non-U.S. | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	159,531	164,515	188,153
Energy Products | Non-U.S. | Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	(109)	131	322
Energy Products | Non-U.S. | Other income
Segment Reporting Information [Line Items]
Total revenues	192	87	208
Chemical Products | United States
Segment Reporting Information [Line Items]
Total revenues	16,058	16,074	19,881
Crude oil and product purchases	8,510	8,824	11,551
Operating expenses, excl. depreciation and depletion	4,781	4,560	4,900
Depreciation and depletion (includes impairments)	611	605	542
Interest expense	1	2	0
Other taxes and duties	68	61	40
Total costs and other deductions	13,971	14,052	17,033
Segment income (loss) before income taxes	2,087	2,022	2,848
Income tax expense (benefit)	460	396	520
Net income (loss) including noncontrolling interests	1,627	1,626	2,328
Net income (loss) attributable to noncontrolling interests	0	0	0
Net income (loss) attributable to ExxonMobil	1,627	1,626	2,328
Additions to property, plant and equipment	474	600	1,026
Investments in equity companies	3,016	3,086	3,124
Total Assets	17,445	17,599	17,342
Chemical Products | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(7,329)	(7,991)	(9,081)
Chemical Products | United States | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	8,558	7,951	10,670
Chemical Products | United States | Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	166	126	91
Chemical Products | United States | Other income
Segment Reporting Information [Line Items]
Total revenues	5	6	39
Chemical Products | Non-U.S.
Segment Reporting Information [Line Items]
Total revenues	18,853	18,730	22,951
Crude oil and product purchases	12,621	13,096	15,847
Operating expenses, excl. depreciation and depletion	4,419	4,643	5,022
Depreciation and depletion (includes impairments)	485	706	446
Interest expense	1	2	1
Other taxes and duties	78	78	79
Total costs and other deductions	17,604	18,525	21,395
Segment income (loss) before income taxes	1,249	205	1,556
Income tax expense (benefit)	262	158	292
Net income (loss) including noncontrolling interests	987	47	1,264
Net income (loss) attributable to noncontrolling interests	37	36	49
Net income (loss) attributable to ExxonMobil	950	11	1,215
Additions to property, plant and equipment	1,161	1,775	1,692
Investments in equity companies	2,649	2,700	2,417
Total Assets	17,692	17,076	15,875
Chemical Products | Non-U.S. | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(3,893)	(3,643)	(5,201)
Chemical Products | Non-U.S. | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	14,338	14,314	16,949
Chemical Products | Non-U.S. | Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	615	761	771
Chemical Products | Non-U.S. | Other income
Segment Reporting Information [Line Items]
Total revenues	7	12	30
Specialty Products | United States
Segment Reporting Information [Line Items]
Total revenues	8,274	8,633	8,764
Crude oil and product purchases	4,160	4,718	5,112
Operating expenses, excl. depreciation and depletion	1,931	1,822	2,028
Depreciation and depletion (includes impairments)	104	93	95
Interest expense	0	0	0
Other taxes and duties	7	6	5
Total costs and other deductions	6,202	6,639	7,240
Segment income (loss) before income taxes	2,072	1,994	1,524
Income tax expense (benefit)	494	458	334
Net income (loss) including noncontrolling interests	1,578	1,536	1,190
Net income (loss) attributable to noncontrolling interests	2	0	0
Net income (loss) attributable to ExxonMobil	1,576	1,536	1,190
Additions to property, plant and equipment	230	81	37
Investments in equity companies	0	0	0
Total Assets	2,882	2,620	2,839
Specialty Products | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(2,462)	(2,570)	(2,587)
Specialty Products | United States | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	5,790	6,044	6,152
Specialty Products | United States | Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	0	0	0
Specialty Products | United States | Other income
Segment Reporting Information [Line Items]
Total revenues	22	19	25
Specialty Products | Non-U.S.
Segment Reporting Information [Line Items]
Total revenues	13,126	13,032	14,641
Crude oil and product purchases	8,753	8,955	10,384
Operating expenses, excl. depreciation and depletion	2,316	2,238	2,388
Depreciation and depletion (includes impairments)	133	222	193
Interest expense	3	2	1
Other taxes and duties	185	174	172
Total costs and other deductions	11,390	11,591	13,138
Segment income (loss) before income taxes	1,736	1,441	1,503
Income tax expense (benefit)	243	235	252
Net income (loss) including noncontrolling interests	1,493	1,206	1,251
Net income (loss) attributable to noncontrolling interests	17	28	26
Net income (loss) attributable to ExxonMobil	1,476	1,178	1,225
Additions to property, plant and equipment	227	370	200
Investments in equity companies	814	952	1,177
Total Assets	8,040	8,379	8,316
Specialty Products | Non-U.S. | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	(573)	(555)	(825)
Specialty Products | Non-U.S. | Sales and other operating revenue
Segment Reporting Information [Line Items]
Total revenues	12,463	12,363	13,727
Specialty Products | Non-U.S. | Income from equity affiliates
Segment Reporting Information [Line Items]
Total revenues	(26)	(25)	(23)
Specialty Products | Non-U.S. | Other income
Segment Reporting Information [Line Items]
Total revenues	$ 116	$ 139	$ 112