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Other Income (Expense), Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Other Income (Expense), Net |  |  |  |  |
Deposit Liabilities, Description | 0 | 0 | 21156894 |  | 0
Deposit Liabilities, Description |  |  | $ 21 |  |
External services | $ 3 | $ 2 | 9 |  | $ 10
Interest income | 7 | 6 | 19 |  | 17
Gains (losses) on investments | 3 | 1 | 2 |  | 4
Miscellaneous | 1 | 2 | 1 |  | 3
Total other income (expense), net | 14 | $ 11 | 52 | $ 34 | $ 34
Increase in Other Income/Expense | 3 |  | $ 18 |  |
Increase in Gains (Losses) | 2 |  |  |  |
Increase in Interest Income | $ 1 |  |  |  |

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