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Revenue Recognition Contract balances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Contract liabilities - current	$ (1,649)		$ (1,649)		$ (1,435)
Total contract balances, net	(264)		(264)		(181)
Contract with Customer, Liability, Revenue Recognized	149	$ 125	1,084	$ 1,137
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Contract assets - current	1,553		1,553		1,395
Other Noncurrent Assets
Disaggregation of Revenue [Line Items]
Contract assets - noncurrent	95		95		104
Deferred Revenue [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities - current	(1,649)		(1,649)		(1,435)
Other Noncurrent Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract liabilities - noncurrent	$ (263)		$ (263)		$ (245)

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- Definition

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+ References

No definition available.

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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+ References

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