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Restructuring - Schedule of Restructuring Accrual Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Restructuring Reserve [Roll Forward]        
Restructuring charges $ 0 $ 0 $ 41 $ 0
Employee Severance        
Restructuring Reserve [Roll Forward]        
Beginning balance     0  
Restructuring charges 0   41  
Cash payments     (13)  
Ending balance $ 28   $ 28