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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Goodwill [Line Items]            
Goodwill, impairment loss   $ 184,000,000   $ 184,000,000    
Goodwill $ 17,644,000,000     17,644,000,000   $ 17,350,000,000
Amortization of intangible assets 111,000,000   $ 102,000,000 319,000,000 $ 326,000,000  
Silent-Aire            
Goodwill [Line Items]            
Goodwill $ 0     $ 0