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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 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 + Details
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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 + Details
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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 + Details
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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 + Details
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