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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, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Change in Plan Assets: |  |  |
Fair value of plan assets at beginning of year | $ 144 |  |
Fair value of plan assets at end of year | 156 | $ 144 |
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |  |
Change in Benefit Obligations: |  |  |
Benefit obligation at beginning of year | $ 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) |
Benefit obligation at end of year | $ 2 | $ 2 | $ 2
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 | 139 | 133 |
Service cost | 3 | 3 | 4
Interest cost | $ 8 | $ 7 | 4
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 | 5 | 6 |
(Gain) loss from changes in actuarial assumptions and plan experience | 12 | (4) |
Benefits paid | (8) | (5) |
Settlements or curtailments | $ (5) | $ (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 | $ 155 | $ 139 | 133
Change in Plan Assets: |  |  |
Fair value of plan assets at beginning of year | 144 | 135 |
Actual return on plan assets | 13 | 4 |
Employer contribution | 4 | 4 |
Plan participants’ contribution | 1 | 1 |
Foreign currency exchange rate changes | 7 | 7 |
Benefits paid | (8) | (5) |
Settlements or curtailments | (5) | (2) |
Fair value of plan assets at end of year | 156 | 144 | 135
Funded status | 1 | 5 |
Recognized asset (liability) | 1 | 5 |
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member] |  |  |
Change in Benefit Obligations: |  |  |
Benefit obligation at beginning of year | 14 | 16 |
Interest cost | 1 | 1 |
(Gain) loss from changes in actuarial assumptions and plan experience | 1 | (1) |
Benefits paid | $ (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) |
Benefit obligation at end of year | $ 13 | $ 14 | 16
Change in Plan Assets: |  |  |
Employer contribution | 2 | 2 |
Benefits paid | (2) | (2) |
Funded status | (13) | (14) |
Recognized asset (liability) | (13) | (14) |
Postretirement Benefits [Member] | Foreign Plans [Member] |  |  |
Change in Benefit Obligations: |  |  |
Benefit obligation at beginning of year | 11 | 13 |
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 |
(Gain) loss from changes in actuarial assumptions and plan experience | $ 2 | (3) |
Benefits paid | (1) | (1) |
Settlements or curtailments | (1) |  |
Benefit obligation at end of year | 12 | 11 | $ 13
Change in Plan Assets: |  |  |
Employer contribution | 2 | 1 |
Benefits paid | (1) | (1) |
Settlements or curtailments | (1) |  |
Funded status | (12) | (11) |
Recognized asset (liability) | $ (12) | $ (11) |

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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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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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