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Stock-based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Weighted Average Price  
Beginning balance (in dollars per share) | $ / shares $ 42.46
Granted (in dollars per share) | $ / shares 66.77
Exercised (in dollars per share) | $ / shares 38.17
Forfeited or expired (in dollars per share) | $ / shares 59.31
Ending balance (in dollars per share) | $ / shares 45.44
Exercisable (in dollars per share) | $ / shares $ 39.11
Shares Subject to Option/SAR  
Beginning balance (in shares) | shares 5,683,847
Granted (in shares) | shares 570,140
Exercised (in shares) | shares (1,068,612)
Forfeited or expired (in shares) | shares (265,459)
Ending balance (in shares) | shares 4,919,916
Exercisable (in shares) | shares 3,762,092
Weighted Average Remaining Contractual Life (years)  
Outstanding 5 years 9 months
Exercisable 3 years 9 months 29 days
Aggregate Intrinsic Value (in millions)  
Outstanding | $ $ 56
Exercisable | $ $ 53