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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]    
Contract liabilities - current $ 1,918 $ 1,804
Accounts receivable - net    
Disaggregation of Revenue [Line Items]    
Contract assets - current 2,080 2,067
Other noncurrent assets    
Disaggregation of Revenue [Line Items]    
Contract assets - noncurrent 79 79
Deferred revenue    
Disaggregation of Revenue [Line Items]    
Contract liabilities - current 1,918 1,804
Other noncurrent liabilities    
Disaggregation of Revenue [Line Items]    
Contract liabilities - noncurrent $ 292 $ 282