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Revenue Recognition Contract balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Contract liabilities - current	$ (1,971)		$ (1,971)		$ (1,637)
Contract with Customer, Liability, Revenue Recognized	308	$ 221	1,059	$ 935
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Contract assets - current	1,851		1,851		1,718
Other Noncurrent Assets
Disaggregation of Revenue [Line Items]
Contract assets - noncurrent	90		90		99
Deferred Revenue [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities - current	(1,971)		(1,971)		(1,637)
Other Noncurrent Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities - noncurrent	$ (285)		$ (285)		$ (269)

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