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Revenue Recognition Contract balances (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Current	$ (1,451)		$ (1,451)		$ (1,407)
Contract with Customer Asset Liability Net	(64)		(64)		(45)
Contract with Customer, Liability, Revenue Recognized	125	$ 130	1,137	$ 1,056
Revenue, Remaining Performance Obligation, Amount	$ 14,400		$ 14,400
Remaining Performance Obligations Expected as Revenue Over the Next Two Years	60.00%		60.00%
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net, Current	$ 1,409		$ 1,409		1,389
Other Noncurrent Assets
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net, Noncurrent	98		98		90
Other Noncurrent Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Noncurrent	(120)		(120)		(117)
Deferred Revenue [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Current	$ (1,451)		$ (1,451)		$ (1,407)

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- Definition

Contract with Customer Asset Liability Net

+ References

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- Definition

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ 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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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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