Cover shares in Millions	9 Months Ended
Jun. 30, 2025 shares
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2025
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	8027 Forsyth Blvd
Entity Address, City or Town	St. Louis,
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63105
City Area Code	314
Local Phone Number	553-2000
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	562.8
Entity Central Index Key	0000032604
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
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 \| 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
New York Stock Exchange \| 3.000% Notes due 2031
Entity Information [Line Items]
Title of 12(b) Security	3.000% Notes due 2031
Trading Symbol	EMR 31A
Security Exchange Name	NYSE
New York Stock Exchange \| 3.500% Notes due 2037
Entity Information [Line Items]
Title of 12(b) Security	3.500% Notes due 2037
Trading Symbol	EMR 37
Security Exchange Name	NYSE
NYSE Texas \| 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

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Local phone number for entity.

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