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Guarantees (Tables) | 12 Months Ended
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Sep. 30, 2018
Product Warranties Disclosures [Abstract] |
Changes in Carrying Amount of Product Warranty Liability | The changes in the carrying amount of the Company’s total product warranty liability, including extended warranties for which deferred revenue is recorded, for the fiscal years ended September 30, 2018 and 2017 were as follows (in millions):
| Year Ended September 30,
| 2018 |  | 2017
Balance at beginning of period | $ | 409 |  |  | $ | 374 |
Accruals for warranties issued during the period | 309 |  |  | 312 |
Accruals from acquisitions and divestitures (1) | — |  |  | 7 |
Accruals related to pre-existing warranties (including changes in estimates) | (26 | ) |  | (4 | )
Settlements made (in cash or in kind) during the period | (297 | ) |  | (280 | )
Currency translation | (3 | ) |  | — |
Balance at end of period | $ | 392 |  |  | $ | 409 |
(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 Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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