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Other Income (Expense), Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Other Income (Expense), Net |  |  |  |
External services | $ 3 | $ 3 | $ 10 | $ 9
Interest income | 3 | 3 | 9 | 14
Gains (losses) on investments | 5 | 10 | 16 | 4
Miscellaneous | 0 | 0 | 2 | 0
Other income (expense), net | $ 11 | $ 16 | $ 37 | $ 27

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