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Stock-Based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Summary of Stock Options |
| Shares Under Option |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value (in millions)
Outstanding, October 1, 2022 | 6,029,629 |  |  | $ | 67.95 |  |  |  |  |
Exercised | (245,991) |  |  | 47.15 |  |  |  |  |
Forfeited or expired | (942,905) |  |  | 71.52 |  |  |  |  |
Granted | 1,539,275 |  |  | 65.55 |  |  |  |  |
Outstanding, September 30, 2023 | 6,380,008 |  |  | $ | 67.65 |  |  | 6.2 |  | $ | 7 |
Exercisable, September 30, 2023 | 4,422,711 |  |  | $ | 66.94 |  |  | 5.2 |  | $ | 7 |
Schedule of Assumptions of Fair Value Calculation of Each Year's Grants | Assumptions used in the fair value calculation are as of the grant dates and are outlined in the following table.
| 2023 |  | 2022 |  | 2021
Expected life (in years) | 4.5 |  | 4.4 |  | 4.3
Risk-free interest rate | 3.9 | % |  | 1.1 | % |  | 0.3 | %
Expected volatility | 31.2 | % |  | 30.0 | % |  | 32.2 | %
Expected dividend yield | 2.9 | % |  | 2.4 | % |  | 3.4 | %
Schedule of Summary of Restricted Stock |
| Number of Shares |  | Weighted Average Grant- Date Fair Value Per Share |  | Weighted Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value (in millions)
Nonvested, October 1, 2022 | 1,606,531 |  |  | $ | 76.36 |  |  |  |  |
Granted | 1,006,545 |  |  | 62.23 |  |  |  |  |
Dividends | 26,709 |  |  | 62.56 |  |  |  |  |
Vested | (669,511) |  |  | 79.38 |  |  |  |  |
Forfeited | (334,359) |  |  | 71.47 |  |  |  |  |
Nonvested, September 30, 2023 | 1,635,915 |  |  | $ | 67.20 |  |  | 1.5 |  | $ | 83 |
Schedule of Summary of Performance-Based Shares | The following table summarizes the performance-based shares at the maximum award amounts based upon the respective performance share agreements. Actual shares that will vest depend on the level of attainment of the performance-based criteria.
| Number of Shares |  | Weighted Average Grant- Date Fair Value Per Share |  | Weighted Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value (in millions)
Nonvested, October 1, 2022 | 1,781,519 |  |  | $ | 58.13 |  |  |  |  |
Granted | 938,835 |  |  | 48.80 |  |  |  |  |
Vested | (243,782) |  |  | 90.05 |  |  |  |  |
Forfeited | (830,423) |  |  | 50.74 |  |  |  |  |
Nonvested, September 30, 2023 | 1,646,149 |  |  | $ | 51.81 |  |  | 1.2 |  | $ | 83 |

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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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