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Stock-Based Compensation - Share-Based Payment Arrangement, Expensed and Capitalized, Amount (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Share-Based Payment Arrangement [Abstract] |  |  |
Compensation expense | $ 101 | $ 104 | $ 97
Income tax benefit resulting from share-based compensation arrangements | 25 | 26 | 24
Tax impact from exercise and vesting of equity settled awards | $ 7 | $ 12 | $ 12

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