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Restructuring - Schedule of Restructuring Accrual Activity (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Restructuring Reserve [Roll Forward]        
Restructuring $ 40 $ 40 $ 0 $ 0
Employee Severance        
Restructuring Reserve [Roll Forward]        
Beginning balance   0    
Restructuring   40    
Cash payments   (21)    
Ending Balance   $ 19 $ 0