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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, 2025
Sep. 30, 2024
Sep. 30, 2023
Amounts recognized in the Consolidated Balance Sheets at September 30:      
Long-term Employee Benefit Obligations $ (1,069) $ (942)  
Pension Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning obligation 2,913 2,617  
Service cost 34 88 $ 91
Interest cost 123 139 129
Benefits paid (74) (201)  
Actuarial (gain) loss (33) 241  
Curtailments/settlements (163) (21)  
Other, includes translation 36 51  
Ending obligation 2,837 2,913 2,617
Change in fair value of plan assets:      
Beginning fair value 2,557 2,129  
Actual return on plan assets 73 395  
Employer contribution 46 200  
Benefits paid (74) (201)  
Settlements (163) (21)  
Other, includes translation 28 54  
Ending fair value 2,466 2,557 $ 2,129
Funded Status at September 30:      
Unfunded benefit obligation (371) (356)  
Amounts recognized in the Consolidated Balance Sheets at September 30:      
Other Assets 129 99  
Salaries, wages and related items (18) (12)  
Long-term Employee Benefit Obligations (482) (443)  
Net amount recognized (371) (356)  
Amounts recognized in Accumulated other comprehensive income (loss) before income taxes at September 30:      
Prior service credit 1 2  
Net actuarial loss (621) (636)  
Net amount recognized $ (620) $ (634)