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Share-Based Compensation - Summary of SARs Outstanding (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Sep. 30, 2025
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 4,995
SARs, granted (shares) | shares 520
SARs, exercised (shares) | shares (373)
SARs, forfeited, canceled or expired (shares) | shares (181)
SARs, ending balance (shares) | shares 4,961
SARs, Vested and expected to vest at ending balance (shares) | shares 4,842
SARs, Exercisable at ending balance (shares) | shares 3,769
Weighted Average Grant Date Fair Value  
SARs, weighted average exercise price, beginning balance (in USD per share) | $ / shares $ 217.07
SARs, weighted average exercise price, granted (in USD per share) | $ / shares 221.60
SARs, weighted average exercise price, exercised (in USD per share) | $ / shares 136.19
SARs, weighted average exercise price, forfeited, canceled or expired (in USD per share) | $ / shares 232.87
SARs, weighted average exercise price, ending balance (in USD per share) | $ / shares 223.05
SARs, weighted average exercise price, vested and expected to vest (in USD per share) | $ / shares 222.83
SARs, weighted average exercise price, exercisable (in USD per share) | $ / shares $ 220.25
SARs, weighted average remaining contractual term (in years) 5 years
SARs, weighted average remaining contractual term, vested and expected to vest (in years) 4 years 11 months 1 day
SARs, weighted average remaining contractual term, exercisable (in years) 3 years 11 months 26 days
SARs, aggregate intrinsic value | $ $ 22
SARs, aggregate intrinsic value, vested and expected to vest | $ 22
SARs, aggregate intrinsic value, exercisable | $ $ 22