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Pension and Post Retirement Plans (Tables)
 12 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Retirement Plans Expense
Retirement plans expense includes the following components:
U.S. PlansNon-U.S. Plans
2021 2022 2023 2021 2022 2023 
Defined benefit plans:
     Service cost (benefits earned during the period)$54 49 25 29 25 20 
     Interest cost94 99 164 32 33 50 
     Expected return on plan assets(264)(253)(247)(74)(56)(39)
     Net amortization and other143 102 (55)14 3 18 
       Net periodic pension expense (income)27 (3)(113)1 5 49 
Defined contribution plans114 124 111 52 52 49 
             Total retirement plans expense (income)$141 121 (2)53 57 98 
Reconciliations of Actuarial Present Value of Projected Benefit Obligations and Fair Value of Plan Assets for Defined Benefit Pension Plans
Details of the changes in the actuarial present value of the projected benefit obligation and the fair value of plan assets for defined benefit pension plans follow:
U.S. PlansNon-U.S. Plans
2022 2023 2022 2023 
Projected benefit obligation, beginning$4,338 3,112 1,562 965 
     Service cost49 25 25 20 
     Interest cost99 164 33 50 
     Actuarial gain(1,170)(75)(404)(25)
     Curtailments— (31)— — 
     Benefits paid(204)(204)(40)(42)
     Settlements— (2)(29)(70)
     Acquisitions (Divestitures), net— (56)— (46)
     Foreign currency translation and other— 1 (182)74 
Projected benefit obligation, ending$3,112 2,934 965 926 
Fair value of plan assets, beginning$4,844 3,625 1,474 908 
     Actual return on plan assets(1,030)230 (337)(40)
     Employer contributions15 14 28 32 
     Benefits paid(204)(204)(40)(42)
     Settlements— (2)(29)(70)
     Acquisitions (Divestitures), net— (74)— 2 
     Foreign currency translation and other— 1 (188)74 
Fair value of plan assets, ending$3,625 3,590 908 864 
     Net amount recognized in the balance sheet $513 656 (57)(62)
Location of net amount recognized in the balance sheet:
Noncurrent asset$663 815 205 180 
Noncurrent asset held-for-sale13 — — — 
Current liability (14)(14)(17)(17)
Noncurrent liability(149)(145)(203)(225)
Net liability held-for-sale— — (42)— 
     Net amount recognized in the balance sheet $513 656 (57)(62)
Pretax accumulated other comprehensive loss$(284)(257)(136)(181)
Schedule of Weighted-Average Assumptions Used in Valuations of Pension Benefits
The weighted-average assumptions used in the valuation of pension benefits follow:
U.S. PlansNon-U.S. Plans
2021 2022 2023 2021 2022 2023 
Net pension expense
Discount rate used to determine service cost3.16 %3.16 %5.66 %1.9 %2.2 %4.9 %
Discount rate used to determine interest cost2.10 %2.31 %5.49 %1.9 %2.2 %4.9 %
Expected return on plan assets6.50 %6.00 %6.00 %5.6 %4.4 %4.4 %
Rate of compensation increase3.25 %4.00 %4.00 %3.6 %3.7 %4.0 %
Benefit obligations
Discount rate2.92 %5.64 %6.03 %2.2 %4.9 %5.2 %
Rate of compensation increase3.25 %4.00 %4.00 %3.7 %4.0 %3.9 %
Schedule of Asset Allocations and Weighted-Average Target Allocations
The Company's asset allocations at September 30, 2023 and 2022, and weighted-average target allocations follow:
U.S. PlansNon-U.S. Plans
2022 2023 Target2022 2023 Target
Equity securities39 %39 %
35-45%
11 %8 %
5-15%
Debt securities54 51 
50-60
73 75 
70-80
Other7 10 
0-10
16 17 
10-20
     Total100 %100 %100 %100 %100 %100 %
The fair values of defined benefit pension assets as of September 30, organized by asset class and by the fair value hierarchy of ASC 820, Fair Value Measurement, follow. Investments valued based on the net asset value (NAV) of fund units held, as derived from the fair value of the underlying assets, are excluded from the fair value hierarchy.
Level 1Level 2Level 3Measured at NAVTotal%
2023
U.S. equities$396 9 — 619 1,024 23 %
International equities210 14 — 103 327 7 %
Emerging market equities— 1 — 118 119 3 %
Corporate bonds— 1,008 — 843 1,851 42 %
Government bonds— 505 — 124 629 14 %
Other121 7 126 250 504 11 %
     Total$727 1,544 126 2,057 4,454 100 %
2022
U.S. equities$405 6 633 1,044 23 %
International equities225 10 123 358 8 %
Emerging market equities— 1 124 125 3 %
Corporate bonds— 1,143 859 2,002 44 %
Government bonds— 468 152 620 14 %
Other(9)7 130 256 384 8 %
     Total$621 1,635 130 2,147 4,533 100 %