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Restructuring and Related Costs - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Restructuring Reserve [Roll Forward]      
Additional restructuring and related costs $ 411 $ 827 $ 555
Various 2023 Restructuring Plans      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 105 261  
Utilized—cash (163) (116)  
Utilized—noncash (42) (40)  
Additional restructuring and related costs 143    
Other 32    
Restructuring reserve, ending balance 75 105 261
Various 2023 Restructuring Plans | Employee Severance and Termination Benefits      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 93 191  
Utilized—cash (138) (98)  
Utilized—noncash 0 0  
Additional restructuring and related costs 71    
Other 32    
Restructuring reserve, ending balance 58 93 191
Various 2023 Restructuring Plans | Long-Lived Asset Impairments      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 37  
Utilized—cash 0 0  
Utilized—noncash (41) (37)  
Additional restructuring and related costs 41    
Other 0    
Restructuring reserve, ending balance 0 0 37
Various 2023 Restructuring Plans | Other      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 12 33  
Utilized—cash (25) (18)  
Utilized—noncash (1) (3)  
Additional restructuring and related costs 31    
Other 0    
Restructuring reserve, ending balance $ 17 $ 12 $ 33