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Share-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions We estimated the fair value of each stock option on the date of grant using the Black-Scholes pricing model and the following assumptions:
202520242023
Average risk-free interest rate4.07 %4.22 %3.78 %
Expected dividend yield1.76 %1.79 %1.82 %
Expected volatility35 %34 %34 %
Expected term (years)4.94.84.8
Schedule of Share-Based Compensation, Stock Options, Activity
A summary of stock option activity for the year ended September 30, 2025, is as follows:
Shares
(in thousands)		Wtd. Avg.
Exercise
Price		Wtd. Avg.
Remaining
Contractual
Term (years)		Aggregate
Intrinsic Value
of In-The-Money
Options
(in millions)
Outstanding at October 1, 20241,884 $214.03   
Granted190 297.07   
Exercised(571)177.76   
Forfeited(32)279.45   
Canceled(18)335.27   
Outstanding at September 30, 20251,453 233.92 5.3$168 
Exercisable at September 30, 20251,085 216.77 4.2144 
Schedule of Nonvested Performance-based Units Activity
A summary of performance share activity for the year ended September 30, 2025, is as follows:
Shares
(in thousands)		Wtd. Avg.
Grant Date
Share
Fair Value
Outstanding at October 1, 2024159 $347.92 
Granted (1)
58 387.72 
Adjustment for performance results achieved (2)
(31)481.28 
Forfeited(17)329.35 
Outstanding at September 30, 2025169 338.95 
(1) Performance shares granted assuming achievement of performance goals at target.
(2) Adjustments were due to the number of shares vested under fiscal 2022 awards at the end of the three-year performance period ended September 30, 2024, being lower than the target number of shares.
Schedule of Performance Shares Vested
The following table summarizes information about performance shares vested during the years ended September 30, 2025, 2024, and 2023:
202520242023
Percent payout— %92 %177 %
Shares vested (in thousands)— 31 48 
Total fair value of shares vested (in millions)$— $9 $13 
Schedule of Share-Based Payment Award, Performance-Based Units, Valuation Assumptions
The per share fair value of performance share awards granted during the years ended September 30, 2025, 2024, and 2023, was $387.72, $295.06, and $340.77, respectively, which we determined using a Monte Carlo simulation and the following assumptions:
202520242023
Average risk-free interest rate4.11 %4.45 %4.08 %
Expected dividend yield1.76 %1.79 %1.82 %
Expected volatility34 %30 %39 %
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of restricted stock and restricted stock unit activity for the year ended September 30, 2025, is as follows:
Shares
(in thousands)		Wtd. Avg.
Grant Date
Share
Fair Value
Outstanding at October 1, 2024468 $274.55 
Granted102 299.05 
Vested(214)279.75 
Forfeited(31)272.92 
Outstanding at September 30, 2025325 278.96