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Acquisitions and Divestitures Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 27 Months Ended
Nov. 17, 2020
USD ($)
Oct. 01, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2023
USD ($)
Business Acquisition & Disposal [Line Items]              
Purchase price of businesses, net of cash acquired       $ 1,611 $ 114 $ 126  
Goodwill     $ 7,777 7,777   $ 6,734  
Forecast [Member]              
Business Acquisition & Disposal [Line Items]              
Pretax periodic distribution from retained subordinated interest in Vertiv (VRT)             $ 600
Open Systems International Inc. [Member]              
Business Acquisition & Disposal [Line Items]              
Deferred revenue adjustment     3 11      
Open Systems International Inc. [Member] | Order or Production Backlog [Member]              
Business Acquisition & Disposal [Line Items]              
Backlog amortization     7 24      
Series of Individually Immaterial Business Acquisitions [Member]              
Business Acquisition & Disposal [Line Items]              
Purchase price of businesses, net of cash acquired $ 19            
Number of businesses acquired           3  
Automation Solutions [Member]              
Business Acquisition & Disposal [Line Items]              
Goodwill     6,594 6,594   $ 5,583  
Automation Solutions [Member] | Open Systems International Inc. [Member]              
Business Acquisition & Disposal [Line Items]              
Purchase price of businesses, net of cash acquired   $ 1,600          
Annualized sales           $ 170  
Goodwill   960          
Goodwill expected tax deductible amount   0          
Intangibles   $ 783          
Intangible assets, weighted average useful life   11 years          
Deferred tax liabilities   $ 185          
Automation Solutions [Member] | Series of Individually Immaterial Business Acquisitions [Member]              
Business Acquisition & Disposal [Line Items]              
Number of businesses acquired           2  
Climate Technologies [Member]              
Business Acquisition & Disposal [Line Items]              
Goodwill     $ 757 $ 757   $ 730  
Climate Technologies [Member] | Series of Individually Immaterial Business Acquisitions [Member]              
Business Acquisition & Disposal [Line Items]              
Number of businesses acquired           1