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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
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses |  |  | $ (2)
(Loss) gain on settlements |  |  | (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) |
Net changes recognized in Total other comprehensive (income) loss |  |  | (6)
Pension Benefits [Member] | Foreign Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses | $ 1 | $ (2) | (15)
Prior service (credit) cost |  |  | (1)
Amortization of prior unrecognized loss | $ 1 | (1) | (3)
Loss on divestiture |  | $ (2) |
(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) |
Net changes recognized in Total other comprehensive (income) loss | $ 2 | $ (5) | $ (20)
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses | (1) | (4) |
Amortization of prior unrecognized loss | 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)
Net changes recognized in Total other comprehensive (income) loss |  | (3) |
Postretirement Benefits [Member] | Foreign Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (gains) losses | (3) | (4) | $ (2)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Other income (expense)
Net changes recognized in Total other comprehensive (income) loss | $ (3) | $ (4) | $ (2)

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