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Revenue Recognition - Contract with Customer, Asset and Liability (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]    
Deferred revenue $ 2,160 $ 1,923
Accounts receivable - net    
Disaggregation of Revenue [Line Items]    
Contract assets - current 1,931 2,339
Other noncurrent assets    
Disaggregation of Revenue [Line Items]    
Contract assets - noncurrent 11 12
Deferred revenue    
Disaggregation of Revenue [Line Items]    
Deferred revenue 2,160 1,923
Other noncurrent liabilities    
Disaggregation of Revenue [Line Items]    
Contract liabilities - noncurrent $ 252 $ 225