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Revenue Recognition - Performance Obligations and Costs to Obtain or Fulfill a Contract (Details) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 14,900,000,000
Remaining Performance Obligations Expected as Revenue Over the Next Two Years	60.00%
Capitalized Contract Cost, Gross	$ 236,000,000		$ 223,000,000
Capitalized Contract Cost, Amortization	41,000,000	$ 26,000,000
Capitalized Contract Cost, Impairment Loss	0	$ 0
Other Current Assets
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Gross	135,000,000		119,000,000
Other Noncurrent Assets
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Gross	$ 101,000,000		$ 104,000,000

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- Definition

Remaining Performance Obligations Expected as Revenue Over the Next Two Years

+ References

No definition available.

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

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