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Financial Information by Segment - Schedule of Income (Loss) from Continuing Operations before Income Taxes and Equity in Earnings of Affiliated Companies for Unallocated and Other (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Interest expense | $ (19) | $ (19) | $ (56) | $ (62)
Less: Equity in earnings of affiliated companies, net of tax | 1 | 2 | 5 | 5
Unallocated and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest expense | (19) | (19) | (56) | (62)
Unallocated corporate costs | (13) | (16) | (39) | (51)
General unallocated income (expense) | 6 | 6 | 22 | 34
Less: Equity in earnings of affiliated companies, net of tax | 1 | 2 | 5 | 5
Income from continuing operations before income taxes and equity in earnings of affiliated companies | (30) | (33) | (91) | (140)
Certain Items [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Global restructuring activities | (3) | (1) | (6) | (13)
Legal and environmental matters and reserves |  |  | (6) | (1)
Other certain items |  | 1 | (1) | 1
Total certain items | $ (3) | (2) | $ (13) | (56)
Certain Items [Member] | Argentina [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Controlled currency devaluation and other losses |  | $ (2) |  | $ (43)

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