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Financial Information by Segment - Schedule of Details of Certain Items (Detail) - Certain Items [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Segment Reporting [Line Items] |  |  |  |
Global restructuring activities (Note I) | $ (42) | $ (3) | $ (57) | $ (6)
Employee benefit plan settlement and other charges (Note E) | (30) |  | (30) |
Legal and environmental matters and reserves (Note F) | (5) |  | (5) | (6)
Acquisition and integration-related charges (Note C) | (1) |  | (2) |
Other certain items |  |  |  | (1)
Total certain items | $ (78) | $ (3) | $ (94) | $ (13)

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