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Accumulated Other Comprehensive Income (Loss)
9 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)
        Accumulated other comprehensive income (loss) ("AOCI") represents market valuation adjustments related to TVA's currency swaps. The currency swaps are cash flow hedges and are the only derivatives in TVA's portfolio that have been designated and qualify for hedge accounting treatment. TVA records exchange rate gains and losses on its foreign currency-denominated debt and any related accrued interest in net income and marks its currency swap assets and liabilities to market through other comprehensive income (loss) ("OCI"). TVA then reclassifies an amount out of AOCI into net income, offsetting the exchange gain/loss recorded on the debt. During the three months ended June 30, 2020 and 2019, TVA reclassified $7 million of gains and $13 million of losses, respectively, related to its cash flow hedges from AOCI to Interest expense. During the nine months ended June 30, 2020 and 2019, TVA reclassified $10 million of gains and $17 million of losses, respectively, related to its cash flow hedges from AOCI to Interest expense. See Note 14 — Risk Management Activities and Derivative Transactions.

        TVA records certain assets and liabilities that result from the regulated ratemaking process that would not be recorded under GAAP for non-regulated entities. As such, certain items that would generally be reported in AOCI or that would impact the statements of operations are recorded as regulatory assets or regulatory liabilities. See Note 8 — Regulatory Assets and Liabilities for a schedule of regulatory assets and liabilities.  See Note 14 — Risk Management Activities and Derivative Transactions for a discussion of the recognition in AOCI of gains and losses associated with certain derivative contracts. See Note 15 — Fair Value Measurements for a discussion of the recognition of certain investment fund gains and losses as regulatory assets and liabilities.  See Note 19 — Benefit Plans for a discussion of the regulatory accounting related to components of TVA's benefit plans.