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Share-Based Compensation (Tables) | 12 Months Ended
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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:
|  | 2025 |  | 2024 |  | 2023
Average risk-free interest rate |  | 4.07 | % |  | 4.22 | % |  | 3.78 | %
Expected dividend yield |  | 1.76 | % |  | 1.79 | % |  | 1.82 | %
Expected volatility |  | 35 | % |  | 34 | % |  | 34 | %
Expected term (years) |  | 4.9 |  | 4.8 |  | 4.8
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, 2024 |  | 1,884 |  |  | $ | 214.03 |  |  |  |  |
Granted |  | 190 |  |  | 297.07 |  |  |  |  |
Exercised |  | (571) |  |  | 177.76 |  |  |  |  |
Forfeited |  | (32) |  |  | 279.45 |  |  |  |  |
Canceled |  | (18) |  |  | 335.27 |  |  |  |  |
Outstanding at September 30, 2025 |  | 1,453 |  |  | 233.92 |  |  | 5.3 |  | $ | 168 |
Exercisable at September 30, 2025 |  | 1,085 |  |  | 216.77 |  |  | 4.2 |  | 144 |
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, 2024 |  | 159 |  |  | $ | 347.92 |
Granted (1) |  | 58 |  |  | 387.72 |
Adjustment for performance results achieved (2) |  | (31) |  |  | 481.28 |
Forfeited |  | (17) |  |  | 329.35 |
Outstanding at September 30, 2025 |  | 169 |  |  | 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:
|  | 2025 |  | 2024 |  | 2023
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:
|  | 2025 |  | 2024 |  | 2023
Average risk-free interest rate |  | 4.11 | % |  | 4.45 | % |  | 4.08 | %
Expected dividend yield |  | 1.76 | % |  | 1.79 | % |  | 1.82 | %
Expected volatility |  | 34 | % |  | 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, 2024 |  | 468 |  |  | $ | 274.55 |
Granted |  | 102 |  |  | 299.05 |
Vested |  | (214) |  |  | 279.75 |
Forfeited |  | (31) |  |  | 272.92 |
Outstanding at September 30, 2025 |  | 325 |  |  | 278.96 |

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- Definition Disclosure of assumptions used in determining the fair value of performance share awards on the date of grant. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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