Disclosures About Segments And Related Information (Schedule Of Segments And Related Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment reporting information [Line Items]
Revenues	$ 83,130	$ 83,083
Crude oil and product purchases	46,788	47,601
Depreciation and depletion (includes impairments)	5,702	4,812
Interest expense	205	221
Other taxes and duties	6,035	6,323
Total costs and other deductions	71,530	70,714
Segment income (loss) before income taxes	11,600	12,369
Income tax expense (benefit)	3,567	3,803
Net income (loss) including noncontrolling interests	8,033	8,566
Net income (loss) attributable to noncontrolling interests	320	346
Net income (loss) attributable to ExxonMobil	7,713	8,220
Additions to property, plant and equipment	6,029	5,074
Investments in equity companies	34,003		$ 34,010
Total Assets	451,908		453,475
Operating Segments
Segment reporting information [Line Items]
Revenues	113,593	115,489
Crude oil and product purchases	77,087	80,176
Operating expenses, excl. depreciation and depletion	12,474	11,523
Depreciation and depletion (includes impairments)	5,427	4,591
Interest expense	44	47
Other taxes and duties	6,036	6,324
Total costs and other deductions	101,068	102,661
Segment income (loss) before income taxes	12,525	12,828
Income tax expense (benefit)	3,676	3,884
Net income (loss) including noncontrolling interests	8,849	8,944
Net income (loss) attributable to noncontrolling interests	338	362
Net income (loss) attributable to ExxonMobil	8,511	8,582
Additions to property, plant and equipment	5,510	4,562
Investments in equity companies	34,135		34,118
Total Assets	415,918		411,124
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment reporting information [Line Items]
Revenues	316	581
Net income (loss) attributable to ExxonMobil	(798)	(362)
Additions to property, plant and equipment	519	512
Investments in equity companies	(132)		(108)
Total Assets	35,990		42,351
Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(30,779)	(32,987)
Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	81,058	80,411
Sales and other operating revenue | Operating Segments
Segment reporting information [Line Items]
Revenues	81,039	80,387
Income from equity affiliates
Segment reporting information [Line Items]
Revenues	1,369	1,842
Income from equity affiliates | Operating Segments
Segment reporting information [Line Items]
Revenues	1,429	1,914
Other income
Segment reporting information [Line Items]
Revenues	703	830
Other income | Operating Segments
Segment reporting information [Line Items]
Revenues	346	201
Other Revenue, Interest | Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment reporting information [Line Items]
Revenues	363	474
U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	34,607	30,656
Non-U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	46,451	49,755
Upstream | U.S.
Segment reporting information [Line Items]
Revenues	13,743	8,034
Crude oil and product purchases	5,429	2,993
Operating expenses, excl. depreciation and depletion	2,763	1,727
Depreciation and depletion (includes impairments)	3,038	1,842
Interest expense	37	28
Other taxes and duties	64	98
Total costs and other deductions	11,331	6,688
Segment income (loss) before income taxes	2,412	1,346
Income tax expense (benefit)	542	292
Net income (loss) including noncontrolling interests	1,870	1,054
Net income (loss) attributable to noncontrolling interests	0	0
Net income (loss) attributable to ExxonMobil	1,870	1,054
Additions to property, plant and equipment	2,780	2,028
Investments in equity companies	4,933		4,884
Total Assets	153,432		154,914
Upstream | U.S. | Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(6,556)	(5,988)
Upstream | U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	7,318	2,190
Upstream | U.S. | Income from equity affiliates
Segment reporting information [Line Items]
Revenues	4	(105)
Upstream | U.S. | Other income
Segment reporting information [Line Items]
Revenues	(135)	(39)
Upstream | Non-U.S.
Segment reporting information [Line Items]
Revenues	15,431	15,351
Crude oil and product purchases	3,261	2,483
Operating expenses, excl. depreciation and depletion	2,281	2,630
Depreciation and depletion (includes impairments)	1,689	2,035
Interest expense	6	15
Other taxes and duties	539	613
Total costs and other deductions	7,776	7,776
Segment income (loss) before income taxes	7,655	7,575
Income tax expense (benefit)	2,598	2,825
Net income (loss) including noncontrolling interests	5,057	4,750
Net income (loss) attributable to noncontrolling interests	171	144
Net income (loss) attributable to ExxonMobil	4,886	4,606
Additions to property, plant and equipment	2,022	1,664
Investments in equity companies	21,359		21,396
Total Assets	136,606		134,609
Upstream | Non-U.S. | Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(9,850)	(9,980)
Upstream | Non-U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	3,960	3,526
Upstream | Non-U.S. | Income from equity affiliates
Segment reporting information [Line Items]
Revenues	1,247	1,708
Upstream | Non-U.S. | Other income
Segment reporting information [Line Items]
Revenues	374	137
Energy Products | U.S.
Segment reporting information [Line Items]
Revenues	28,601	31,437
Crude oil and product purchases	25,106	27,276
Operating expenses, excl. depreciation and depletion	2,082	2,014
Depreciation and depletion (includes impairments)	195	196
Interest expense	0	1
Other taxes and duties	787	820
Total costs and other deductions	28,170	30,307
Segment income (loss) before income taxes	431	1,130
Income tax expense (benefit)	94	236
Net income (loss) including noncontrolling interests	337	894
Net income (loss) attributable to noncontrolling interests	40	58
Net income (loss) attributable to ExxonMobil	297	836
Additions to property, plant and equipment	116	142
Investments in equity companies	454		444
Total Assets	33,105		32,143
Energy Products | U.S. | Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(4,624)	(6,558)
Energy Products | U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	23,885	24,803
Energy Products | U.S. | Income from equity affiliates
Segment reporting information [Line Items]
Revenues	36	33
Energy Products | U.S. | Other income
Segment reporting information [Line Items]
Revenues	56	43
Energy Products | Non-U.S.
Segment reporting information [Line Items]
Revenues	42,774	46,205
Crude oil and product purchases	35,046	38,351
Operating expenses, excl. depreciation and depletion	2,159	2,138
Depreciation and depletion (includes impairments)	173	189
Interest expense	1	2
Other taxes and duties	4,562	4,703
Total costs and other deductions	41,941	45,383
Segment income (loss) before income taxes	833	822
Income tax expense (benefit)	187	138
Net income (loss) including noncontrolling interests	646	684
Net income (loss) attributable to noncontrolling interests	116	144
Net income (loss) attributable to ExxonMobil	530	540
Additions to property, plant and equipment	228	321
Investments in equity companies	923		915
Total Assets	46,181		43,399
Energy Products | Non-U.S. | Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(6,672)	(6,752)
Energy Products | Non-U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	36,077	39,409
Energy Products | Non-U.S. | Income from equity affiliates
Segment reporting information [Line Items]
Revenues	1	25
Energy Products | Non-U.S. | Other income
Segment reporting information [Line Items]
Revenues	24	19
Chemical Products | U.S.
Segment reporting information [Line Items]
Revenues	3,721	4,117
Crude oil and product purchases	2,154	2,291
Operating expenses, excl. depreciation and depletion	1,063	991
Depreciation and depletion (includes impairments)	145	159
Interest expense	0	0
Other taxes and duties	16	17
Total costs and other deductions	3,378	3,458
Segment income (loss) before income taxes	343	659
Income tax expense (benefit)	88	155
Net income (loss) including noncontrolling interests	255	504
Net income (loss) attributable to noncontrolling interests	0	0
Net income (loss) attributable to ExxonMobil	255	504
Additions to property, plant and equipment	145	100
Investments in equity companies	2,998		3,016
Total Assets	17,400		17,445
Chemical Products | U.S. | Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(1,675)	(1,865)
Chemical Products | U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	2,022	2,194
Chemical Products | U.S. | Income from equity affiliates
Segment reporting information [Line Items]
Revenues	23	57
Chemical Products | U.S. | Other income
Segment reporting information [Line Items]
Revenues	1	1
Chemical Products | Non-U.S.
Segment reporting information [Line Items]
Revenues	4,263	4,881
Crude oil and product purchases	3,015	3,351
Operating expenses, excl. depreciation and depletion	1,084	1,060
Depreciation and depletion (includes impairments)	122	109
Interest expense	0	0
Other taxes and duties	22	19
Total costs and other deductions	4,243	4,539
Segment income (loss) before income taxes	20	342
Income tax expense (benefit)	(6)	50
Net income (loss) including noncontrolling interests	26	292
Net income (loss) attributable to noncontrolling interests	8	11
Net income (loss) attributable to ExxonMobil	18	281
Additions to property, plant and equipment	117	235
Investments in equity companies	2,663		2,649
Total Assets	18,023		17,692
Chemical Products | Non-U.S. | Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(739)	(1,025)
Chemical Products | Non-U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	3,385	3,646
Chemical Products | Non-U.S. | Income from equity affiliates
Segment reporting information [Line Items]
Revenues	140	205
Chemical Products | Non-U.S. | Other income
Segment reporting information [Line Items]
Revenues	(1)	5
Specialty Products | U.S.
Segment reporting information [Line Items]
Revenues	1,916	2,127
Crude oil and product purchases	997	1,146
Operating expenses, excl. depreciation and depletion	472	428
Depreciation and depletion (includes impairments)	27	22
Interest expense	0	0
Other taxes and duties	2	2
Total costs and other deductions	1,498	1,598
Segment income (loss) before income taxes	418	529
Income tax expense (benefit)	96	125
Net income (loss) including noncontrolling interests	322	404
Net income (loss) attributable to noncontrolling interests	0	0
Net income (loss) attributable to ExxonMobil	322	404
Additions to property, plant and equipment	49	14
Investments in equity companies	0		0
Total Assets	2,837		2,882
Specialty Products | U.S. | Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(549)	(655)
Specialty Products | U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	1,367	1,469
Specialty Products | U.S. | Income from equity affiliates
Segment reporting information [Line Items]
Revenues	0	0
Specialty Products | U.S. | Other income
Segment reporting information [Line Items]
Revenues	0	3
Specialty Products | Non-U.S.
Segment reporting information [Line Items]
Revenues	3,144	3,337
Crude oil and product purchases	2,079	2,285
Operating expenses, excl. depreciation and depletion	570	535
Depreciation and depletion (includes impairments)	38	39
Interest expense	0	1
Other taxes and duties	44	52
Total costs and other deductions	2,731	2,912
Segment income (loss) before income taxes	413	425
Income tax expense (benefit)	77	63
Net income (loss) including noncontrolling interests	336	362
Net income (loss) attributable to noncontrolling interests	3	5
Net income (loss) attributable to ExxonMobil	333	357
Additions to property, plant and equipment	53	58
Investments in equity companies	805		814
Total Assets	8,334		$ 8,040
Specialty Products | Non-U.S. | Intersegment Eliminations
Segment reporting information [Line Items]
Revenues	(114)	(164)
Specialty Products | Non-U.S. | Sales and other operating revenue
Segment reporting information [Line Items]
Revenues	3,025	3,150
Specialty Products | Non-U.S. | Income from equity affiliates
Segment reporting information [Line Items]
Revenues	(22)	(9)
Specialty Products | Non-U.S. | Other income
Segment reporting information [Line Items]
Revenues	$ 27	$ 32