| Cover | May 16, 2022 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 16, 2022 |
| Entity File Number | 1-278 |
| Entity Registrant Name | Emerson Electric Co. |
| Entity Central Index Key | 0000032604 |
| Entity Tax Identification Number | 43-0259330 |
| Entity Incorporation, State or Country Code | MO |
| Entity Address, Address Line One | 8000 West Florissant Avenue |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock of $0.50 par value per share | |
| Title of 12(b) Security | Common Stock of $0.50 par value per share |
| Trading Symbol | EMR |
| Security Exchange Name | NYSE |
| 0.375% Notes due 2024 | |
| Title of 12(b) Security | 0.375% Notes due 2024 |
| Trading Symbol | EMR 24 |
| Security Exchange Name | NYSE |
| 1.250% Notes due 2025 | |
| Title of 12(b) Security | 1.250% Notes due 2025 |
| Trading Symbol | EMR 25A |
| Security Exchange Name | NYSE |
| 2.000% Notes due 2029 | |
| Title of 12(b) Security | 2.000% Notes due 2029 |
| Trading Symbol | EMR 29 |
| Security Exchange Name | NYSE |
