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Stock-based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2022
USD ($)
$ / shares
shares
Weighted Average Price  
Beginning balance (in dollars per share) | $ / shares $ 38.84
Granted (in dollars per share) | $ / shares 79.54
Exercised (in dollars per share) | $ / shares 33.77
Forfeited or expired (in dollars per share) | $ / shares 50.97
Ending balance (in dollars per share) | $ / shares 42.46
Exercisable (in dollars per share) | $ / shares $ 37.86
Shares Subject to Option/SAR  
Beginning balance (in shares) | shares 5,951,011
Granted (in shares) | shares 548,398
Exercised (in shares) | shares (542,903)
Forfeited or expired (in shares) | shares (272,659)
Ending balance (in shares) | shares 5,683,847
Exercisable (in shares) | shares 4,082,897
Weighted Average Remaining Contractual Life (years)  
Outstanding 5 years 8 months 12 days
Exercisable 4 years 1 month 6 days
Aggregate Intrinsic Value (in millions)  
Outstanding | $ $ 52
Exercisable | $ $ 47