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Benefit Plans - Change in Benefit Obligation, Change in Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Amounts recognized in the Consolidated Balance Sheets at September 30:      
Long-term Employee Benefit Obligations $ (942) $ (1,023)  
Pension Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning obligation 2,617 2,634  
Service cost 88 91 $ 134
Interest cost 139 129 77
Benefits paid (201) (67)  
Actuarial gain 241 (24)  
Curtailments/settlements (21) (214)  
Other, includes translation 51 68  
Ending obligation 2,913 2,617 2,634
Change in fair value of plan assets:      
Beginning fair value 2,129 2,242  
Actual return on plan assets 395 33  
Employer contribution 200 62  
Benefits paid (201) (67)  
Settlements (21) (200)  
Other, includes translation 54 59  
Ending fair value 2,557 2,129 $ 2,242
Funded Status at September 30:      
Unfunded benefit obligation (356) (488)  
Amounts recognized in the Consolidated Balance Sheets at September 30:      
Other Assets 99 81  
Salaries, wages and related items (12) (15)  
Long-term Employee Benefit Obligations (443) (554)  
Net amount recognized (356) (488)  
Amounts recognized in Accumulated other comprehensive income (loss) before income taxes at September 30:      
Prior service credit 2 3  
Net actuarial loss (636) (689)  
Net amount recognized $ (634) $ (686)