Document And Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Jan. 31, 2025	Jun. 28, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Transition Report	false
Entity File Number	1-2256
Entity Registrant Name	Exxon Mobil Corporation
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	13-5409005
Entity Address Address Line 1	22777 Springwoods Village Parkway
Entity Address City or Town	Spring
Entity Address State or Province	TX
Entity Address Postal Zip Code	77389-1425
City Area Code	972
Local Phone Number	940-6000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Financial Statement Error Correction [Flag]	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 511
Entity Common Stock Shares Outstanding		4,339,143,313
Documents Incorporated by Reference Text Block	Proxy Statement for the 2025 Annual Meeting of Shareholders (Part III)
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Central Index Key	0000034088
Common Stock, without par value [Member]
Document Information [Line Items]
Security 12(b) Title	Common Stock, without par value
Trading Symbol	XOM
Security Exchange Name	NYSE
0.524% Notes Due in 2028 [Member]
Document Information [Line Items]
Security 12(b) Title	0.524% Notes due 2028
Trading Symbol	XOM28
Security Exchange Name	NYSE
0.835% Notes Due in 2032 [Member]
Document Information [Line Items]
Security 12(b) Title	0.835% Notes due 2032
Trading Symbol	XOM32
Security Exchange Name	NYSE
1.408% Notes Due in 2039 [Member]
Document Information [Line Items]
Security 12(b) Title	1.408% Notes due 2039
Trading Symbol	XOM39A
Security Exchange Name	NYSE