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Significant Accounting Policies - Schedule of Change Retrospectively to Prior Periods Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Significant Accounting Policies [Line Items] |  |  |  |
Net income (loss) | $ 99 | $ 55 | $ (176) | $ 194
Deferred tax provision (benefit) |  |  | 131 | (25)
Inventories |  |  | $ (77) | (61)
Change in Method of Accounting for Inventories from Last-in, First-out Method to First-in, First-out Method [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Net income (loss) |  | 55 |  | 194
Deferred tax provision (benefit) |  |  |  | (25)
Inventories |  |  |  | (61)
Change in Method of Accounting for Inventories from Last-in, First-out Method to First-in, First-out Method [Member] | As Originally Reported [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Net income (loss) |  | 53 |  | 191
Deferred tax provision (benefit) |  |  |  | (26)
Inventories |  |  |  | (57)
Change in Method of Accounting for Inventories from Last-in, First-out Method to First-in, First-out Method [Member] | Effect of Change [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Net income (loss) |  | $ 2 |  | 3
Deferred tax provision (benefit) |  |  |  | 1
Inventories |  |  |  | $ (4)

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