Revenue Recognition Contract balances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Contract liabilities - current	$ (1,846)		$ (1,846)		$ (1,637)
Contract with Customer, Liability, Revenue Recognized	193	$ 149	1,252	$ 1,084
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Contract assets - current	1,951		1,951		1,718
Other Noncurrent Assets
Disaggregation of Revenue [Line Items]
Contract assets - noncurrent	104		104		99
Deferred Revenue [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities - current	(1,846)		(1,846)		(1,637)
Other Noncurrent Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities - noncurrent	$ (278)		$ (278)		$ (269)