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Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss), Pre-Tax (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) | Other income (expense)
Pension Benefits [Member] | Foreign Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses | $ 9 | $ 1 | $ (2)
Prior service (credit) cost | $ (1) |  |
Amortization of prior unrecognized gains (losses) |  | $ 1 | (1)
Loss on divestiture |  |  | $ (2)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) | Other income (expense)
Net changes recognized in Total other comprehensive (income) loss | $ 8 | $ 2 | $ (5)
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses |  | (1) | (4)
Amortization of prior unrecognized gains (losses) | $ 2 | $ 1 |
(Loss) gain on settlements |  |  | $ 1
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) | Other income (expense)
Net changes recognized in Total other comprehensive (income) loss | $ 2 |  | $ (3)
Postretirement Benefits [Member] | Foreign Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses | $ 2 | $ (3) | $ (4)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) | Other income (expense)
Net changes recognized in Total other comprehensive (income) loss | $ 2 | $ (3) | $ (4)

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