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Stock-based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Weighted Average Price  
Beginning balance (in dollars per share) | $ / shares $ 45.44
Granted (in dollars per share) | $ / shares 53.52
Exercised (in dollars per share) | $ / shares 40.39
Forfeited or expired (in dollars per share) | $ / shares 63.47
Ending balance (in dollars per share) | $ / shares 46.51
Exercisable (in dollars per share) | $ / shares $ 41.21
Shares Subject to Option/SAR  
Beginning balance (in shares) | shares 4,919,916
Granted (in shares) | shares 652,702
Exercised (in shares) | shares (1,004,234)
Forfeited or expired (in shares) | shares (323,602)
Ending balance (in shares) | shares 4,244,782
Exercisable (in shares) | shares 3,141,132
Weighted Average Remaining Contractual Life (years)  
Outstanding 5 years 8 months 19 days
Exercisable 4 years 1 month 28 days
Aggregate Intrinsic Value (in millions)  
Outstanding | $ $ 133
Exercisable | $ $ 115