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Other Income (Expense), Net Other Income (Expense), Net (Tables) | 12 Months Ended
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Sep. 30, 2018
Other Income and Expenses [Abstract] |
Other Income (Expense), Net | Income and expenses not related to TVA’s operating activities are summarized in the following table:
Other Income (Expense), Net For the years ended September 30
| 2018 |  | 2017 |  | 2016
Interest income | $ | 23 |  |  | $ | 23 |  |  | $ | 24 |
External services | 14 |  |  | 14 |  |  | 12 |
Gains (losses) on investments | 6 |  |  | 9 |  |  | 7 |
Miscellaneous | 7 |  |  | 10 |  |  | — |
Total other income (expense), net | $ | 50 |  |  | $ | 56 |  |  | $ | 43 |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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