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Debt and Other Obligations Credit Facility Agreements (Details) | 9 Months Ended |
--- | --- | ---
Jun. 30, 2022 USD ($) Credit_facilities | Sep. 30, 2021 USD ($)
Line of Credit Facility [Line Items] |  |
Summary of Long-Term Credit Facilities | The following table provides additional information regarding TVA's funding available under the four long-term revolving credit facilities:
Summary of Long-Term Credit Facilities At June 30, 2022 (in millions)
Maturity Date |  | Facility Limit |  | Letters of Credit Outstanding |  | Cash Borrowings |  | Availability
February 2024 |  | $ | 150 |  |  | $ | 38 |  |  | $ | — |  |  | $ | 112 |
February 2025 |  | 500 |  |  | 500 |  |  | — |  |  | — |
September 2026 |  | 1,000 |  |  | 99 |  |  | — |  |  | 901 |
March 2027 |  | 1,000 |  |  | 106 |  |  | — |  |  | 894 |
Total |  | $ | 2,650 |  |  | $ | 743 |  |  | $ | — |  |  | $ | 1,907 |
Borrowings under U.S. Treasury credit facility | $ 0 |
February 2022 Credit Facility | 1,000,000,000 |
Line of Credit |  |
Line of Credit Facility [Line Items] |  |
Current borrowing capacity for credit facilities | 150,000,000 |
Revolving Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Current borrowing capacity for credit facilities | $ 2,650,000,000 |
Number of revolving credit facilities | Credit_facilities | 4 |
December 2019 Credit Facility | $ 150,000,000 |
June 2020 Credit Facility | 500,000,000 |
September 2020 Credit Facility | 1,000,000,000 |
Cash Borrowings-December 2019 Credit Facility | 0 |
Cash Borrowings-June 2020 Credit Facility | 0 |
Cash Borrowings-September 2020 Credit Facility | 0 |
Total Cash Borrowings for Credit Facilities | 0 |
Remaining Availability, December 2019 Credit Facility | 112,000,000 |
Remaining Availability, February 2022 Credit Facility | 894,000,000 |
Long-term Line of Credit, Borrowings 3 | 0 |
Remaining Availability, June 2020 Credit Facility | 0 |
Remaining Availability, September 2020 Credit Facility | 901,000,000 |
Total Remaining Availability for Credit Facilities | 1,907,000,000 |
Letter of Credit |  |
Line of Credit Facility [Line Items] |  |
Letters of Credit Outstanding, Amount 1 | 500,000,000 |
Letter of Credit Outstanding, December 2019 Credit Facility | 38,000,000 |
Letter of Credit Outstanding, February 2022 Credit Facility | 106,000,000 |
Letter of Credit Outstanding, September 2020 Credit Facility | 99,000,000 |
Amount of letters of credit outstanding for credit facilities | $ 743,000,000 | $ 1,200,000,000

X
- Definition Borrowings under U.S. Treasury credit facility + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contingent obligation under letters of credit outstanding as of the reporting date for facility 2. + References No definition available. + Details
Name: | tve_LetterofCreditOutstandingAmount2
Namespace Prefix: | tve_
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Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contingent obligation under letters of credit outstanding as of the reporting date for facility 1. + References No definition available. + Details
Name: | tve_LettersofCreditOutstandingAmount1
Namespace Prefix: | tve_
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Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contingent obligation under letters of credit outstanding as of the reporting date for facility 3. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contingent obligation under letters of credit outstanding as of the reporting date for facility 4. + References No definition available. + Details
Name: | tve_LettersofCreditOutstandingAmount4
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Facility 1. + References No definition available. + Details
Name: | tve_LineofCreditFacilityRemainingBorrowingCapacity1
Namespace Prefix: | tve_
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Facility 2. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Facility 3. + References No definition available. + Details
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X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Facility 4. + References No definition available. + Details
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- Definition Long-term Line of Credit, Borrowings 3 + References No definition available. + Details
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- Definition Fair value of the amount under the credit facility 1 (cash borrowings). + References No definition available. + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. (For cash borrowings on facility 2). + References No definition available. + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. (For cash borrowings on facility 4). + References No definition available. + Details
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X
- Definition The number of revolving credit facilities. + References No definition available. + Details
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X
- Definition Amount of current borrowing capacity under the first revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References No definition available. + Details
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X
- Definition Amount of current borrowing capacity under the second revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References No definition available. + Details
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X
- Definition Amount of current borrowing capacity under the third revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References No definition available. + Details
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Balance Type: | credit
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X
- Definition Amount of current borrowing capacity under the fourth revolving credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References No definition available. + Details
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Balance Type: | credit
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X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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