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Stock-based Compensation (Details) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2021 USD ($) Plan $ / shares shares | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares
Stock Based Compensation Activity [Line Items] |  |  |
Shares authorized for issuance under 2021 Plan (in shares) | shares | 55 |  |
Shares available for issuance under the 2021 Plan (in shares) | shares | 54 |  |
Number of share-based compensation plans | Plan | 4 |  |
Compensation cost charged against income from share-based compensation plans | $ 97 | $ 66 | $ 103
Total income tax benefit recognized for share-based compensation arrangements | 24 | 16 | 26
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | 12 | 1 | 6
Proceeds from the exercise of stock options | $ 178 | $ 75 | $ 171
Employee Stock Option |  |  |
Stock Based Compensation Activity [Line Items] |  |  |
Expiration period for stock options | 10 years |  |
Weighted-average grant-date fair value of options granted | $ / shares | $ 9.36 | $ 7.29 | $ 5.56
Total intrinsic value of options exercised | $ 94 | $ 30 | $ 73
Proceeds from the exercise of stock options | 178 | 75 | 171
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 10 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 7 months 6 days |  |
Stock Appreciation Rights (SARs) |  |  |
Stock Based Compensation Activity [Line Items] |  |  |
Payments towards exercise of SARs granted | $ 3 | $ 2 | $ 3
Restricted (Nonvested) Stock |  |  |
Stock Based Compensation Activity [Line Items] |  |  |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 103 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years |  |
Performance Shares |  |  |
Stock Based Compensation Activity [Line Items] |  |  |
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 29 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 9 months 18 days |  |
Minimum | Employee Stock Option |  |  |
Stock Based Compensation Activity [Line Items] |  |  |
Vesting period | 2 years |  |
Maximum | Employee Stock Option |  |  |
Stock Based Compensation Activity [Line Items] |  |  |
Vesting period | 3 years |  |
Maximum | Restricted (Nonvested) Stock |  |  |
Stock Based Compensation Activity [Line Items] |  |  |
Vesting period | 3 years |  |

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