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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2020 USD ($) Bond_issues | Sep. 30, 2019 Bond_issues
Derivative |  |
Number of British pound sterling denominated bond transactions | 3 |
Number of currency swaps outstanding |  | 3
Associated TVA bond issues currency exposure | $ | $ 600 |
Minimum |  |
Derivative |  |
Expiration date range of swaps | 2021 |
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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Balance Type: | credit
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- Definition Expiration Date of Swap + References No definition available. + Details
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Balance Type: | na
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- Definition Number of British pound streling denominated bond transactions + 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=121590274&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=121590274&loc=SL5580258-113959 + Details
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- Details
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