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Share-based Compensation - Summary of Option Activity (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Stock Options Additional Disclosures  
Stock price used to calculate aggregate intrinsic value (in dollars per share) $ 230.01
Stock Option  
Options  
Beginning balance (in shares) | shares 6,168,624
Granted (in shares) | shares 798,017
Forfeited (in shares) | shares (32,358)
Expired (in shares) | shares (2,716)
Exercised (in shares) | shares (1,006,212)
Ending balance (in shares) | shares 5,925,355
Options exercisable at end of period (in shares) | shares 4,241,861
Options exercisable and expected to vest at end of period (in shares) | shares 5,884,022
Weighted- Average Exercise Price Per Share  
Beginning balance (in dollars per share) $ 145.92
Granted (in dollars per share) 211.09
Forfeited (in dollars per share) 205.35
Expired (in dollars per share) 191.77
Exercised (in dollars per share) 98.54
Ending balance (in dollars per share) 162.40
Options exercisable at end of period (in dollars per share) 144.75
Options exercisable and expected to vest at end of period (in dollars per share) $ 162.07
Stock Options Additional Disclosures  
Outstanding as of September 30, 2023 5 years 11 months 15 days
Options exercisable as of September 30, 2023 5 years 3 days
Options exercisable and expected to vest as of September 30, 2023 5 years 11 months 8 days
Outstanding as of September 30, 2023 | $ $ 401
Options exercisable as of September 30, 2023 | $ 362
Options exercisable and expected to vest at September 30, 2023 | $ $ 400