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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Loss Contingencies [Line Items]    
Reserve for environmental liabilities, current $ 66 $ 48
Reserve for environmental liabilities, noncurrent 220 54
Total reserves for environmental liabilities 286 102
Total asbestos-related liabilities 438 458
Total asbestos-related assets 300 378
Net asbestos-related liabilities 138 80
Restricted    
Insurance recoveries for asbestos-related liabilities 55 58
Total insurable liabilities 341 325
Insurance receivables, current 10 5
Insurance receivables, noncurrent 20 15
Total insurable receivables $ 30 $ 20
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other noncurrent liabilities Other noncurrent liabilities
Asbestos Issue    
Loss Contingencies [Line Items]    
Total asbestos-related assets $ 245 $ 320
Restricted    
Cash 6 6
Investments 239 314
Other current liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 58 58
Restricted    
Total insurable liabilities $ 89 $ 77
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities
Other noncurrent liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities $ 380 $ 400
Restricted    
Total insurable liabilities $ 230 $ 226
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Other noncurrent liabilities Other noncurrent liabilities
Other current assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets $ 37 $ 13
Other noncurrent assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 263 365
Accrued compensation and benefits    
Restricted    
Total insurable liabilities $ 22 $ 22