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Revenue Recognition Costs to Obtain or Fulfill a Contract (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Capitalized Contract Cost, Gross | $ 228,000,000 |  | $ 228,000,000 |  | $ 212,000,000
Capitalized Contract Cost, Amortization | 43,000,000 | $ 34,000,000 | 69,000,000 | $ 69,000,000 |
Capitalized Contract Cost, Impairment Loss |  |  | 0 |  |
Other Noncurrent Assets |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Capitalized Contract Cost, Gross | 105,000,000 |  | 105,000,000 |  | 102,000,000
Other Current Assets |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Capitalized Contract Cost, Gross | $ 123,000,000 |  | $ 123,000,000 |  | $ 110,000,000

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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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