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Revenue Recognition Contract balances (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Contract liabilities - current	$ (1,583)		$ (1,435)
Total contract balances, net	(332)		(181)
Contract with Customer, Liability, Revenue Recognized	714	$ 686
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Contract assets - current	1,404		1,395
Other Noncurrent Assets
Disaggregation of Revenue [Line Items]
Contract assets - noncurrent	104		104
Deferred Revenue [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities - current	(1,583)		(1,435)
Other Noncurrent Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities - noncurrent	$ (257)		$ (245)

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+ References

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