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Other Income (Expense), Net Other Income (Expense), Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Other Income (Expense), Net |  |  |
Other income | $ 28 | $ 0 | $ (21)
Interest income | 12 | 18 | 25
External services | 13 | 12 | 13
Gain (Loss) on Investments | 16 | 9 | 3
Miscellaneous | 0 | (3) | 0
Other income (expense), net | $ 13 | $ 36 | $ 62

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