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Guarantees (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2016
Guarantor Obligations [Line Items] |  |  |  |
Document Period End Date |  | Sep. 30, 2019 |  |
Insurance Settlements Receivable, Current |  | $ 5 | $ 6 |
Maximum length, in years, of a product warranty for it to be recorded in other current liabilities |  | 1 year |  |
Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities |  | 1 year |  |
Post sale contingent tax indemnification liabilities |  |  | 255 | $ 290
Insurance Settlements Receivable, Noncurrent |  | $ 18 | 20 |
Release of tax indemnification reserve | $ (226) | (226) |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |
Balance at beginning of period |  | 315 | 323 |
Accruals for warranties issued during the period |  | 110 | 128 |
Accruals from acquisitions and divestitures (1) |  | 1 | 0 |
Accruals related to pre-existing warranties (including changes in estimates) |  | (39) | (14) |
Settlements made (in cash or in kind) during the period |  | (101) | (120) |
Currency translation |  | (1) | (2) |
Balance at end of period |  | $ 285 | 315 |
Business Divestitures, Not Specific |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Post sale contingent tax indemnification liabilities |  |  | $ 235 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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