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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Jun. 30, 2021 Bond_issues
Derivative |  |
Number of currency swaps outstanding | Bond_issues |  | 2
Associated TVA bond issues currency exposure | $ | $ 400 |
Minimum |  |
Derivative |  |
Expiration date range of swaps | 2032 |
Maximum |  |
Derivative |  |
Expiration date range of swaps | 2043 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
Name: | tve_AssociatedBondIssuesCurrencyExposure
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Expiration Date of Swap + References No definition available. + Details
Name: | tve_ExpirationDateofSwap
Namespace Prefix: | tve_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of foreign currency exchange rate derivatives held by the entity at the reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 + Details
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- Details
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- Details
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