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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Loss Contingencies [Line Items]    
Reserve for environmental liabilities, current $ 37 $ 31
Reserve for environmental liabilities, noncurrent 180 211
Total reserves for environmental liabilities 217 242
Total asbestos-related liabilities 411 422
Total asbestos-related assets 328 301
Insurance Settlements Receivable, Asbestos-Related 47 50
Net asbestos-related liabilities 83 121
Restricted    
Total self-insured liabilities 353 333
Insurance receivables, current 6 6
Insurance receivables, noncurrent 14 14
Total insurance receivables 20 20
Asbestos Issue    
Loss Contingencies [Line Items]    
Total asbestos-related assets 281 251
Restricted    
Cash 10 20
Investments 271 231
Other current liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 58 58
Restricted    
Total self-insured liabilities 98 86
Other noncurrent liabilities    
Loss Contingencies [Line Items]    
Total asbestos-related liabilities 353 364
Restricted    
Total self-insured liabilities 232 226
Other current assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 18 28
Other noncurrent assets    
Loss Contingencies [Line Items]    
Total asbestos-related assets 310 273
Accrued compensation and benefits    
Restricted    
Total self-insured liabilities $ 23 $ 21