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Share-Based Compensation - Schedule of Unrecognized Compensation Cost (Details)
shares in Millions
 6 Months Ended
Mar. 31, 2023
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares granted (in shares) 2.7
Award vesting period (in years) 4 years
Award requisite service period (in years) 4 years
TBOs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares granted (in shares) 0.9
Weighted Average Grant-Date Fair Value (dollars per share) | $ / shares $ 17.01
Award expiration period (in years) 10 years
RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares granted (in shares) 1.3
Weighted Average Grant-Date Fair Value (dollars per share) | $ / shares $ 40.27
PSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares granted (in shares) 0.5
Weighted Average Grant-Date Fair Value (dollars per share) | $ / shares $ 48.88
Award vesting period (in years) 3 years