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Share-Based Compensation - Summary of SARs Outstanding (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Sep. 30, 2023
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
SARs, beginning balance (shares) | shares 5,544
SARs, granted (shares) | shares 752
SARs, exercised (shares) | shares (1,161)
SARs, forfeited, canceled or expired (shares) | shares (230)
SARs, ending balance (shares) | shares 4,905
SARs, Vested and expected to vest at ending balance (shares) | shares 4,757
SARs, Exercisable at ending balance (shares) | shares 3,428
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
SARs, weighted average exercise price, beginning balance (USD per share) | $ / shares $ 197.31
SARs, weighted average exercise price, granted (USD per share) | $ / shares 238.06
SARs, weighted average exercise price, exercised (USD per share) | $ / shares 156.11
SARs, weighted average exercise price, forfeited, canceled or expired (USD per share) | $ / shares 253.21
SARs, weighted average exercise price, ending balance (USD per share) | $ / shares 211.47
SARs, weighted average exercise price, vested and expected to vest (USD per share) | $ / shares 210.67
SARs, weighted average exercise price, exercisable (USD per share) | $ / shares $ 200.41
SARs, weighted average remaining contractual term 5 years 7 months 28 days
SARs, weighted average remaining contractual term, vested and expected to vest 5 years 6 months 29 days
SARs, weighted average remaining contractual term, exercisable 4 years 6 months 10 days
SARs, aggregate intrinsic value | $ $ 231
SARs, aggregate intrinsic value, vested and expected to vest | $ 228
SARs, aggregate intrinsic value, exercisable | $ $ 199