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Stock-Based Compensation (Supplemental Stock Option Information) (Details) - Stock Options [Member] - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of options granted at the closing market price of common stock on the grant date | 100.00% |  |
Amount of stock option vesting per year | one-third |  |
Stock option expiration years from date of grant years | 10 years |  |
Cash received for stock options exercises | $ 114 | $ 126 | $ 40
Intrinsic value of options exercised | 53 | 47 | 16
Tax benefit from exercise of stock options | $ 6 | $ 8 | $ 8

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