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Revenue - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Revenue From Contracts With Customers [Line Items] |  |
Maximum cash collection period from customer | 60 days |
Cost incurred to obtain contract with customer amortization period of practical expedients | true |
Trade Receivable [Member] |  |
Revenue From Contracts With Customers [Line Items] |  |
Trade receivables | $ 472 | $ 482

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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- Details
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