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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Loss Contingencies [Line Items]    
Reserve for environmental liabilities, current $ 31 $ 66
Reserve for environmental liabilities, noncurrent 211 220
Total reserves for environmental liabilities 242 286
Total asbestos-related liabilities 422 438
Total asbestos-related assets 301 300
Net asbestos-related liabilities 121 138
Restricted    
Insurance receivables for asbestos-related liabilities 50 55
Total self-insured liabilities 333 341
Insurance receivables, current 6 10
Insurance receivables, noncurrent 14 20
Total insurance receivables $ 20 $ 30
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 $ 251 $ 245
Restricted    
Cash 20 6
Investments 231 239
Other current liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 58 58
Restricted    
Total self-insured liabilities $ 86 $ 89
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 $ 364 $ 380
Restricted    
Total self-insured liabilities $ 226 $ 230
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 $ 28 $ 37
Other noncurrent assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 273 263
Accrued compensation and benefits    
Restricted    
Total self-insured liabilities $ 21 $ 22