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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Loss Contingencies [Line Items]    
Reserve for environmental liabilities, current $ 32 $ 28
Reserve for environmental liabilities, noncurrent 179 211
Total reserves for environmental liabilities 211 239
Total asbestos-related liabilities 408 422
Total asbestos-related assets 334 301
Net asbestos-related liabilities 74 121
Restricted    
Insurance receivables for asbestos-related liabilities 47 50
Total self-insured liabilities 351 333
Insurance receivables, current 5 6
Insurance receivables, noncurrent 13 14
Total insurance receivables $ 18 $ 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 $ 287 $ 251
Restricted    
Cash 6 20
Investments 281 231
Other current liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 58 58
Restricted    
Total self-insured liabilities $ 92 $ 86
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 $ 350 $ 364
Restricted    
Total self-insured liabilities $ 239 $ 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 $ 14 $ 28
Other noncurrent assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 320 273
Accrued compensation and benefits    
Restricted    
Total self-insured liabilities $ 20 $ 21