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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2023 USD ($) | Sep. 30, 2022 Bond_issues
Derivative |  |
Number of currency swaps outstanding | Bond_issues |  | 2
Amount of letters of credit outstanding for credit facilities | $ 6 |
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
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- Definition Expiration Date of Swap + References No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + 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 -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A + Details
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