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Other Income (Expense), Net	6 Months Ended
	Mar. 31, 2020
Other Income and Expenses [Abstract]
Other Income (Expense), Net	uring the three months ended March 31, 2020, Other income (expense), net decreased $15 million as compared to the same period of the prior year, primarily driven by $12 million of unrealized losses on the SERP and DCP investments as a result of recent higher volatility in the financial markets associated with the COVID-19 pandemic. During the six months ended March 31, 2020, Other income (expense), net decreased $27 million, primarily driven by $21 million of other income in 2019 related to a deposit liability received by TVA as a down payment on the sale of Bellefonte Nuclear Plant ("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. See Note 20 — Contingencies and Legal Proceedings — Legal Proceedings for a discussion of the lawsuit filed by Nuclear Development, LLC. Additionally, during the six months ended March 31, 2020, TVA experienced $10 million of unrealized losses on the SERP and DCP investments as a result of recent higher volatility in the financial markets associated with the COVID-19 pandemic.

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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

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