Acquisitions And Divestitures (Narrative) (Details) $ in Millions			3 Months Ended								12 Months Ended			27 Months Ended
	Oct. 11, 2021 USD ($)	Oct. 01, 2020 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2023 USD ($)	Nov. 10, 2021 USD ($)
Business Acquisition [Line Items]
Purchases of businesses, net of cash acquired											$ 1,611	$ 126	$ 469
Net sales			$ 4,947	$ 4,697	$ 4,431	$ 4,161	$ 4,558	$ 3,914	$ 4,162	$ 4,151	18,236	16,785	18,372
Deferred tax liabilities			1,198				933				1,198	933
Goodwill			7,723				6,734				7,723	6,734	6,536
Net income (loss)											2,327	1,990	2,328
Restructuring expense											150	284	95
Amortization of intangible assets											470	369	359
Intangible assets, net (excluding goodwill)			2,877				2,468				2,877	2,468
Earnings before income taxes											2,912	2,335	2,859
Scenario, Forecast [Member]
Business Acquisition [Line Items]
Pretax periodic distribution from retained subordinated interest in Vertiv (VRT)														$ 600
Open Systems International, Inc. [Member]
Business Acquisition [Line Items]
Deferred Revenue Adjustment											14
Business Combination, Acquisition Related Costs											6
Open Systems International, Inc. [Member] | Order or Production Backlog [Member]
Business Acquisition [Line Items]
Amortization of intangible assets											30
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Purchases of businesses, net of cash acquired												126	469
Annualized sales												$ 50	300
Goodwill													209
Goodwill, expected tax deductible amount													155
Number of businesses acquired												3
Intangibles													$ 158
Intangible assets, weighted average useful life													9 years
Automation Solutions [Member]
Business Acquisition [Line Items]
Goodwill			6,552				5,583				6,552	$ 5,583	$ 5,467
Restructuring expense											123	$ 232	$ 65
Automation Solutions [Member] | Open Systems International, Inc. [Member]
Business Acquisition [Line Items]
Purchases of businesses, net of cash acquired		$ 1,600
Annualized sales											191
Deferred tax liabilities		193
Goodwill		967
Goodwill, expected tax deductible amount		0
Intangibles		$ 783
Intangible assets, weighted average useful life		11 years
Automation Solutions [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of businesses acquired												2	8
Climate Technologies [Member]
Business Acquisition [Line Items]
Goodwill			$ 753				$ 730				753	$ 730	$ 668
Restructuring expense											$ 15	$ 23	$ 20
Climate Technologies [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of businesses acquired												1
Subsequent Event
Business Acquisition [Line Items]
Periodic distribution from retained subordinated interest in Vertiv (VRT)															$ 438
Subsequent Event | Automation Solutions [Member] | AspenTech [Member]
Business Acquisition [Line Items]
Purchases of businesses, net of cash acquired	$ 6,000
Business Acquisition, Percentage of Voting Interests Acquired	55.00%