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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | [1] | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |
Other Comprehensive Income (Gain), Reclassification Adjustment from AOCI |  |  | $ 10 |  | $ (17) |
Reclassification to earnings from cash flow hedges | $ (7) | $ 13 | $ (10) | [1] | $ 17 | [1]
[1] | There were no amounts excluded from effectiveness testing for any of the periods presented. Based on forecasted foreign currency exchange rates, TVA expects to reclassify approximately $30 million of gains from AOCI to Interest expense within the next 12 months to offset amounts anticipated to be recorded in Interest expense related to exchange gain on the debt.

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