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Other Income (Expense), Net | 12 Months Ended
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Sep. 30, 2019
Other Income and Expenses [Abstract] |
Other Income (Expense), Net | 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
| 2019 |  | 2018 |  | 2017
Bellefonte deposit | $ | 21 |  |  | $ | — |  |  | $ | — |
Interest income | 25 |  |  | 23 |  |  | 23 |
External services | 13 |  |  | 14 |  |  | 14 |
Gains (losses) on investments | 3 |  |  | 6 |  |  | 9 |
Miscellaneous | — |  |  | 7 |  |  | 10 |
Total other income (expense), net | $ | 62 |  |  | $ | 50 |  |  | $ | 56 |
During 2019, Other income (expense), net increased $12 million primarily driven by other income related to a $21 million deposit liability received by TVA as a down payment on the sale of Bellefonte. The purchaser, Nuclear Development, LLC, failed to fulfill the requirements of the sales contract with respect to obtaining NRC approval of the transfer of required nuclear licenses and payment of the remainder of the selling price before the November 30, 2018 closing date. Partially offsetting this increase was a decrease of $5 million resulting from gains on the disposition of prior year property and $2 million of unrealized losses on the SERP and DCP investments.

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- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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