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Guarantees (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Guarantor Obligations [Line Items] |  |  |
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 |  | $ 290 | $ 290
Tax indemnification liabilities related to other divestitures |  | 11 |
Warranties transferred to liabilities held for sale |  | 13 |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |
Balance at beginning of period |  | 374 | 288
Accruals for warranties issued during the period |  | 312 | 314
Accruals from acquisitions and divestitures (1) | [1] | 7 | 83
Accruals related to pre-existing warranties (including changes in estimates) |  | (4) | (17)
Settlements made (in cash or in kind) during the period |  | (280) | (297)
Currency translation |  | 0 | 3
Balance at end of period |  | 409 | $ 374
Business Divestitures, Not Specific |  |  |
Guarantor Obligations [Line Items] |  |  |
Post sale contingent tax indemnification liabilities |  | $ 255 |
[1] | The year ended September 30, 2017 includes $13 million of product warranties transferred to liabilities held for sale on the consolidated statements of financial position. Refer to Note 4, "Discontinued Operations," of the notes to consolidated financial statements for further information regarding the Company's disposal groups classified as held for sale.

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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