Discontinued Operations - Narrative (Details) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	May 31, 2023	Oct. 31, 2022	Dec. 31, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax cash proceeds from divestiture of business					$ 0	$ 17	$ 30
Net sales					3,205	5,824	5,304
Income taxes paid related to gain on divestitures, subsidiary restructurings and transaction fees					2,300
Climate Technologies (excluding Therm-O-Disc)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling common equity interest	40.00%
Climate Technologies (excluding Therm-O-Disc)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price	$ 14,000
Pre-tax cash proceeds from divestiture of business	9,700
Increase in cash proceeds for additional ownership interest	$ 200
Increase in ownership percentage	5.00%
Face value of note received	$ 2,250
Interest accrual percentage on note payable	5.00%
Ownership percentage at time of announcement	45.00%
Net sales					3,156	4,976	$ 4,401
Disposal group, pre-tax earnings						1,000
Pretax gain						10,600
Disposal group, gain (loss) on disposal, net of tax						8,400
Ceased depreciation					96
Discontinued operations costs					57
Less: discontinued operations					2,200
InSinkErator
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price		$ 3,000
Net sales						630
Disposal group, pre-tax earnings						$ 152
Pretax gain			$ 2,800
Disposal group, gain (loss) on disposal, net of tax			$ 2,100
Less: discontinued operations					$ 660
Therm-O-Disc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax gain				$ 486
Disposal group, gain (loss) on disposal, net of tax				$ 429