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Revenues Revenues - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]    
Rebate liability $ 576 $ 526
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01    
Disaggregation of Revenue [Line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 3 years  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 | Products and/or Services    
Disaggregation of Revenue [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 2,100  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 | Consumables    
Disaggregation of Revenue [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 2,500