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Employee Benefit Plans - Change in Projected Benefit Obligations and Change in Plan Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Change in Plan Assets: |  |  |
Fair value of plan assets at beginning of year | $ 135 |  |
Fair value of plan assets at end of year | 144 | $ 135 |
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |  |
Change in Benefit Obligations: |  |  |
Benefit obligation at beginning of year | $ 2 | 3 |
(Gain) loss from changes in actuarial assumptions and plan experience |  | $ (1) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) |
Benefit obligation at end of year | $ 2 | $ 2 | $ 3
Change in Plan Assets: |  |  |
Funded status | (2) | (2) |
Recognized asset (liability) | (2) | (2) |
Pension Benefits [Member] | Foreign Plans [Member] |  |  |
Change in Benefit Obligations: |  |  |
Benefit obligation at beginning of year | 133 | 221 |
Service cost | 3 | 4 | 6
Interest cost | $ 7 | $ 4 | 3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) |
Plan participants’ contribution | $ 1 | $ 1 |
Foreign currency exchange rate changes | 6 | (27) |
(Gain) loss from changes in actuarial assumptions and plan experience | (4) | (43) |
Benefits paid | (5) | (9) |
Settlements or curtailments | $ (2) | $ (2) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) |
Divestiture of a business |  | $ (16) |
Benefit obligation at end of year | $ 139 | 133 | 221
Change in Plan Assets: |  |  |
Fair value of plan assets at beginning of year | 135 | 217 |
Actual return on plan assets | 4 | (35) |
Employer contribution | 4 | 5 |
Plan participants’ contribution | 1 | 1 |
Foreign currency exchange rate changes | 7 | (24) |
Benefits paid | (5) | (9) |
Settlements or curtailments | (2) | (2) |
Divestiture of a business |  | (18) |
Fair value of plan assets at end of year | 144 | 135 | 217
Funded status | 5 | 2 |
Recognized asset (liability) | 5 | 2 |
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |  |
Change in Benefit Obligations: |  |  |
Benefit obligation at beginning of year | 16 | 25 |
Interest cost | 1 |  |
(Gain) loss from changes in actuarial assumptions and plan experience | (1) | (4) |
Benefits paid | $ (2) | (3) |
Settlements or curtailments |  | $ (2) |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) |
Benefit obligation at end of year | $ 14 | $ 16 | 25
Change in Plan Assets: |  |  |
Employer contribution | 2 | 5 |
Benefits paid | (2) | (3) |
Settlements or curtailments |  | (2) |
Funded status | (14) | (16) |
Recognized asset (liability) | (14) | (16) |
Postretirement Benefits [Member] | Foreign Plans [Member] |  |  |
Change in Benefit Obligations: |  |  |
Benefit obligation at beginning of year | 13 | 19 |
Interest cost | $ 1 | $ 1 | 1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other income (expense) | Other income (expense) |
Foreign currency exchange rate changes | $ 1 | $ (2) |
(Gain) loss from changes in actuarial assumptions and plan experience | (3) | (5) |
Benefits paid | (1) |  |
Benefit obligation at end of year | 11 | 13 | $ 19
Change in Plan Assets: |  |  |
Employer contribution | 1 |  |
Benefits paid | (1) |  |
Funded status | (11) | (13) |
Recognized asset (liability) | $ (11) | $ (13) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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