Subsequent Events	12 Months Ended
	Sep. 30, 2022
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTSIn October 2022, the Board of Directors approved and the Company announced an agreement to sell a majority stake in its Climate Technologies business (which constitutes the Climate Technologies segment, excluding Therm-O-Disc which was divested earlier in fiscal 2022) to private equity funds managed by Blackstone ("Blackstone") in a transaction valued at $14.0 billion. Emerson will receive upfront, pre-tax cash proceeds of approximately $9.5 billion and a note of $2.25 billion at close (which will accrue 5 percent interest payable in kind by capitalizing interest), while retaining a 45 percent non-controlling common equity ownership interest in a new standalone joint venture between Emerson and Blackstone. The Climate Technologies business, which includes the Copeland compressor business and the entire portfolio of products and services across all residential and commercial HVAC and refrigeration end-markets, had fiscal 2022 net sales of approximately $5.0 billion and pretax earnings of $1.0 billion. The transaction is expected to close in the first half of calendar year 2023, subject to regulatory approvals and customary closing conditions. On October 31, 2022, the Company completed the divestiture of its InSinkErator business, which manufactures food waste disposers, to Whirlpool Corporation for $3.0 billion. This business had net sales of $630 and pretax earnings of $152 for fiscal 2022 and is reported in the Tools & Home Products segment. The agreement was announced in August 2022 and the assets and liabilities of InSinkErator were classified as held-for-sale as of September 30, 2022 and are included in other current assets, other assets, accrued expenses and other liabilities in the consolidated balance sheet.