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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value, finite lives |  | $ 107 | $ 159
Accumulated Amortization |  | (11) | (22)
Net Intangible Assets, finite lives |  | 96 | 137
Developed Technologies [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value, finite lives | [1] | 50 | 49
Accumulated Amortization | [1] | (1) | (7)
Net Intangible Assets, finite lives | [1] | 49 | 42
Trademarks [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value, finite lives | [1] | 8 | 16
Accumulated Amortization | [1] |  | (1)
Net Intangible Assets, finite lives | [1] | 8 | 15
Customer Relationships [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value, finite lives | [1] | 49 | 94
Accumulated Amortization | [1] | (10) | (14)
Net Intangible Assets, finite lives | [1] | $ 39 | $ 80
[1] | Refer to Note E for intangible assets impairment charges recorded in the second fiscal quarter of 2018.

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