Revenue Recognition - Contract Balances (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Contract liabilities - current	$ (1,774)	$ (1,768)
Accounts receivable - net
Disaggregation of Revenue [Line Items]
Contract assets - current	2,019	2,020
Other noncurrent assets
Disaggregation of Revenue [Line Items]
Contract assets - noncurrent	83	79
Deferred revenue
Disaggregation of Revenue [Line Items]
Contract liabilities - current	(1,774)	(1,768)
Other noncurrent liabilities
Disaggregation of Revenue [Line Items]
Contract liabilities - noncurrent	$ (293)	$ (282)