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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Loss Contingencies [Line Items]    
Reserve for environmental liabilities, current $ 27 $ 32
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other noncurrent liabilities Other noncurrent liabilities
Reserve for environmental liabilities, noncurrent $ 160 $ 179
Total reserves for environmental liabilities 187 211
Total asbestos-related liabilities 387 408
Total asbestos-related assets 339 334
Net asbestos-related liabilities 48 74
Restricted    
Insurance receivables for asbestos-related liabilities 44 47
Total self-insured liabilities 414 351
Insurance receivables, current 4 5
Insurance receivables, noncurrent 13 13
Total insurance receivables $ 17 $ 18
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities
Asbestos Issue    
Loss Contingencies [Line Items]    
Total asbestos-related assets $ 295 $ 287
Restricted    
Cash 5 6
Investments 290 281
Other current liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 58 58
Restricted    
Total self-insured liabilities 87 92
Other noncurrent liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 329 350
Restricted    
Total self-insured liabilities 289 239
Other current assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 13 14
Other noncurrent assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 326 320
Accrued compensation and benefits    
Restricted    
Total self-insured liabilities $ 38 $ 20