Revenue Recognition - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 1,996	$ 1,804
Accounts receivable - net
Disaggregation of Revenue [Line Items]
Contract assets - current	2,370	2,067
Other noncurrent assets
Disaggregation of Revenue [Line Items]
Contract assets - noncurrent	12	79
Deferred revenue
Disaggregation of Revenue [Line Items]
Deferred revenue	1,996	1,804
Other noncurrent liabilities
Disaggregation of Revenue [Line Items]
Contract liabilities - noncurrent	$ 297	$ 282