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Other Income (Expense), Net Other Income (Expense), Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Other Income (Expense), Net |  |  |
Change in other income (expense) | $ 12 |  |
Other income |  | $ 0 | $ 0
Proceeds from Other Deposits | 21 |  |
Interest income | 25 | 23 | 23
External services | 13 | 14 | 14
Gain (Loss) on Investments | 3 | 6 | 9
Gains (losses) on investments | 2 |  |
Miscellaneous |  | 7 | 10
Miscellaneous | 0 |  |
Total other income (expense), net | 62 | $ 50 | $ 56
Gain (Loss) on Disposition of Assets | $ 5 |  |

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