Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended			12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2023	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Revenue	$ 1,245	$ 1,500		$ 2,358	$ 2,817
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	782	1,024		1,513	1,934
Disposal Group, Including Discontinued Operation, General and Administrative Expense	127	161		277	323
Gain (loss) on sale of business	(3)	0		(2,783)	0
Disposal Group, Including Discontinued Operations, Other (income) deductions, net	35	13		79	25
Earnings before income taxes	304	302		3,272	535
Discontinued operations taxes	39	56		1,005	140
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	265	246		2,267	395
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	780			780		$ 815
Disposal Group, Including Discontinued Operation, Inventory, Current	505			505		530
Disposal Group, Including Discontinued Operation, Other Assets, Current	62			62		53
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current	1,171			1,171		1,263
Disposal Group, Including Discontinued Operation, Goodwill, Current	720			720		718
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	347			347		277
Disposal Group, Including Discontinued Operation, Assets	3,585			3,585		3,656
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities, Current [Abstract]	644			644		812
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	494			494		536
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	149			149		167
Disposal Group, Including Discontinued Operation, Liabilities	1,287			1,287		1,515
Cash Provided by (Used in) Operating Activities, Discontinued Operations
Cash Provided by (Used in) Operating Activities, Discontinued Operations				(391)	209
Cash Provided by (Used in) Investing Activities, Discontinued Operations				2,916	(88)
InSinkErator [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price	3,000
Disposal Group, Pre-tax earnings						152
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax				2,800
(Loss) on sale of business, net of tax				2,100
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Revenue						630
Discontinued Operation, Tax Effect of Discontinued Operation				660
Climate Technologies (excluding Therm-O-Disc)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Pre-tax earnings						1,000
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Revenue	1,245	1,255		2,309	2,334	5,000
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	782	866		1,484	1,628
Disposal Group, Including Discontinued Operation, General and Administrative Expense	127	127		269	254
Gain (loss) on sale of business	0	0		0	0
Disposal Group, Including Discontinued Operations, Other (income) deductions, net	35	6		67	12
Earnings before income taxes	301	256		489	440
Discontinued operations taxes	39	56		352	95
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	262	200		137	345
Ceased Depreciation	43			70
Discontinued operations costs	28			55
Discontinued Operation, Tax Effect of Discontinued Operation				245
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	780			780		747
Disposal Group, Including Discontinued Operation, Inventory, Current	505			505		449
Disposal Group, Including Discontinued Operation, Other Assets, Current	62			62		49
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current	1,171			1,171		1,122
Disposal Group, Including Discontinued Operation, Goodwill, Current	720			720		716
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	347			347		265
Disposal Group, Including Discontinued Operation, Assets	3,585			3,585		3,348
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities, Current [Abstract]	644			644		752
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	494			494		475
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	149			149		154
Disposal Group, Including Discontinued Operation, Liabilities	1,287			1,287		1,381
Cash Provided by (Used in) Operating Activities, Discontinued Operations
Cash Provided by (Used in) Operating Activities, Discontinued Operations				44	234
Cash Provided by (Used in) Investing Activities, Discontinued Operations				(139)	(69)
Therm-O-Disc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax						486
(Loss) on sale of business, net of tax						429
Therm-O-Disc &/or InSinkErator
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Revenue	0	245		49	483
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	158		29	306
Disposal Group, Including Discontinued Operation, General and Administrative Expense	0	34		8	69
Gain (loss) on sale of business	(3)	0		(2,783)	0
Disposal Group, Including Discontinued Operations, Other (income) deductions, net	0	7		12	13
Earnings before income taxes	3	46		2,783	95
Discontinued operations taxes	0	0		653	45
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	3	$ 46		2,130	50
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	0			0		68
Disposal Group, Including Discontinued Operation, Inventory, Current	0			0		81
Disposal Group, Including Discontinued Operation, Other Assets, Current	0			0		4
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current	0			0		141
Disposal Group, Including Discontinued Operation, Goodwill, Current	0			0		2
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	0			0		12
Disposal Group, Including Discontinued Operation, Assets	0			0		308
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities, Current [Abstract]	0			0		60
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	0			0		61
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	0			0		13
Disposal Group, Including Discontinued Operation, Liabilities	$ 0			0		$ 134
Cash Provided by (Used in) Operating Activities, Discontinued Operations
Cash Provided by (Used in) Operating Activities, Discontinued Operations				(435)	(25)
Cash Provided by (Used in) Investing Activities, Discontinued Operations				$ 3,055	$ (19)
Forecast [Member] | Climate Technologies (excluding Therm-O-Disc)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			45.00%
Forecast [Member] | Climate Technologies (excluding Therm-O-Disc)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses			$ 9,500
Purchase price			14,000
Proceeds from Sale and Collection of Notes Receivable			$ 2,250