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Revenues (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]    
Rebate liability $ 822 $ 749
Contract with customer, liability $ 495 $ 482
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction (in years) 3 years  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Products and/or Services    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, amount $ 2,400  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Consumables    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, amount $ 2,200