Cover Page - USD ($) shares in Millions, $ in Billions	12 Months Ended
	Sep. 30, 2023	Oct. 31, 2023	Mar. 31, 2023
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2023
Current Fiscal Year End Date	--09-30
Document Transition Report	false
Entity File Number	1-278
Entity Registrant Name	EMERSON ELECTRIC CO.
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	43-0259330
Entity Address, Address Line One	8000 W. Florissant Ave.
Entity Address, Address Line Two	P.O. Box 4100
Entity Address, City or Town	St. Louis,
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63136
City Area Code	314
Local Phone Number	553-2000
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 49.6
Entity Common Stock, Shares Outstanding		570.1
Documents Incorporated by Reference [Text Block]	Portions of Emerson Electric Co. Notice of 2024 Annual Meeting of Shareholders and Proxy Statement incorporated by reference into Part III hereof.
Entity Central Index Key	0000032604
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
New York Stock Exchange | Common Stock of $0.50 par value per share
Entity Information [Line Items]
Title of 12(b) Security	Common Stock of $0.50 par value per share
Trading Symbol	EMR
Security Exchange Name	NYSE
New York Stock Exchange | 0.375% Notes due 2024
Entity Information [Line Items]
Title of 12(b) Security	0.375% Notes due 2024
Trading Symbol	EMR 24
Security Exchange Name	NYSE
New York Stock Exchange | 1.250% Notes due 2025
Entity Information [Line Items]
Title of 12(b) Security	1.250% Notes due 2025
Trading Symbol	EMR 25A
Security Exchange Name	NYSE
New York Stock Exchange | 2.000% Notes due 2029
Entity Information [Line Items]
Title of 12(b) Security	2.000% Notes due 2029
Trading Symbol	EMR 29
Security Exchange Name	NYSE
NYSE Chicago | Common Stock of $0.50 par value per share
Entity Information [Line Items]
Title of 12(b) Security	Common Stock of $0.50 par value per share
Trading Symbol	EMR
Security Exchange Name	CHX