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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Loss Contingencies [Line Items]    
Reserve for environmental liabilities, current $ 28 $ 32
Reserve for environmental liabilities, noncurrent 175 179
Total reserves for environmental liabilities 203 211
Total asbestos-related liabilities 402 408
Total asbestos-related assets 330 334
Insurance Settlements Receivable, Asbestos-Related 46 47
Net asbestos-related liabilities 72 74
Restricted    
Total self-insured liabilities 365 351
Insurance receivables, current 5 5
Insurance receivables, noncurrent 13 13
Total insurance receivables 18 18
Asbestos Issue    
Loss Contingencies [Line Items]    
Total asbestos-related assets 284 287
Restricted    
Cash 7 6
Investments 277 281
Other current liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 58 58
Restricted    
Total self-insured liabilities 98 92
Other noncurrent liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 344 350
Restricted    
Total self-insured liabilities 247 239
Other current assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 15 14
Other noncurrent assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 315 320
Accrued compensation and benefits    
Restricted    
Total self-insured liabilities $ 20 $ 20