XML 185 R78.htm IDEA: XBRL DOCUMENT
v3.21.2

Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Jan. 17, 2012
Short-term debt |  |  |  |
Coupon rate |  |  |  | 7.10%
Short-term debt, net of discounts |  | $ 780 | $ 57 |
Current maturities of long-term debt of variable interest entities issued at par |  | 43 | 41 |
Current maturities of notes payable |  | 0 | 0 |
Total Current maturities of power bonds issued at par |  | 1,028 | 1,787 |
Current maturities of power bonds |  | 1,028 | 1,787 |
Total current debt outstanding, net |  | 1,851 | 1,885 |
Long-term debt |  |  |  |
Long-term power bonds, net |  | 17,457 | 17,956 |
Long-term power bonds | [1] | 17,572 | 18,078 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | (115) | (122) |
Long-term debt of variable interest entities, net |  | 1,006 | 1,048 |
Total long-term debt, net |  | 18,463 | 19,004 |
Foreign Currency Transaction Gain (Loss), before Tax |  | $ 58 | 80 |
880591DX7 |  |  |  |
Short-term debt |  |  |  |
Coupon rate | [2] | 4.65% |  |
Debt Instrument, Maturity Date |  | Jun. 15, 2035 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 436 | 436 |
880591EF5 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 3.77% |  |
Debt Instrument, Maturity Date |  | Jun. 15, 2034 |  |
880591EN8 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 1.875% |  |
Debt Instrument, Maturity Date |  | Aug. 15, 2022 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 0 | 1,000 |
880591ER9 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 2.875% |  |
Debt Instrument, Maturity Date |  | Sep. 15, 2024 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591CJ9 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 6.75% |  |
Debt Instrument, Maturity Date |  | Nov. 01, 2025 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,350 | 1,350 |
880591EU2 [Member] |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 2.875% |  |
Debt Instrument, Maturity Date |  | Feb. 01, 2027 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591300 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 2.134% |  |
Debt Instrument, Maturity Date |  | Jun. 01, 2028 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 256 | 256 |
880591409 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 2.216% |  |
Debt Instrument, Maturity Date |  | May 01, 2029 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 208 | 208 |
880591DM1 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 7.125% |  |
Debt Instrument, Maturity Date |  | May 01, 2030 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591DV1 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 4.70% |  |
Debt Instrument, Maturity Date |  | Jul. 15, 2033 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 472 | 472 |
880591DP4 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 6.587% |  |
Debt Instrument, Maturity Date |  | Jun. 07, 2032 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 337 | 323 |
880591CK6 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 5.98% |  |
Debt Instrument, Maturity Date |  | Apr. 01, 2036 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 121 | 121 |
880591CS9 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 5.88% |  |
Debt Instrument, Maturity Date |  | Apr. 01, 2036 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,500 | 1,500 |
880591CP5 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 6.15% |  |
Debt Instrument, Maturity Date |  | Jan. 15, 2038 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591ED0 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 5.50% |  |
Debt Instrument, Maturity Date |  | Jun. 15, 2038 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 500 | 500 |
880591EH1 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 5.25% |  |
Debt Instrument, Maturity Date |  | Sep. 15, 2039 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 2,000 | 2,000 |
880591EP3 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 3.50% |  |
Debt Instrument, Maturity Date |  | Dec. 15, 2042 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591DU3 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 4.962% |  |
Debt Instrument, Maturity Date |  | Jun. 07, 2043 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 202 | 194 |
880591EB4 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 4.875% |  |
Debt Instrument, Maturity Date |  | Jan. 15, 2048 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 500 | 500 |
880591DZ2 |  |  |  |
Short-term debt |  |  |  |
Coupon rate | [2] | 5.375% |  |
Debt Instrument, Maturity Date |  | Apr. 01, 2056 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591EJ7 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 4.625% |  |
Debt Instrument, Maturity Date |  | Sep. 15, 2060 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591ES7 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 4.25% |  |
Debt Instrument, Maturity Date |  | Sep. 15, 2065 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591EW8 [Member] |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 0.75% |  |
Debt Instrument, Maturity Date |  | May 15, 2025 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000 |
880591EX6 |  |  |  |
Short-term debt |  |  |  |
Coupon rate |  | 1.50% |  |
Debt Instrument, Maturity Date |  | Sep. 15, 2031 |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 500 | 0 |
880591EF5 (6.15.21) |  |  |  |
Long-term debt |  |  |  |
Long-term power bonds, net |  | $ 190 | $ 218 |
[1] | Includes net exchange gain from currency transactions of $58 million and $80 million at September 30, 2021 and 2020
[2] | The coupon rate represents TVA's effective interest rate.

X
- Definition Carrying value as of the balance sheet date of debt not otherwise defined (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion and excluding the unamortized discount, premiums and other. + References No definition available. + Details
Name: | tve_LongTermPowerBonds
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=125521441&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123602790&loc=d3e30226-110892 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=120253306&loc=d3e28228-110885 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124440516&loc=d3e30840-110895 + Details
Name: | us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LongTermDebtNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesPayableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt classified as other, payable within one year or the operating cycle, if longer. + 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(20)) -URI http://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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherLongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt classified as other, payable after one year or the operating cycle, if longer. + 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherLongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer. + 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(a)(7)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherShortTermBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 2: 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)(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 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(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: 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(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_ShortTermBorrowings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ShortTermBorrowingsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer. + References Reference 1: 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(a)(16)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: 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(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_UnsecuredDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + 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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_UnsecuredLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Dx7Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Ef5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591En8Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591ER9Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Cj9Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591EU2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591300Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591409Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Dm1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Dv1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Dp4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Ck6Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Cs9Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Cp5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Ed0Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Eh1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591EP3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Du3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Eb4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Dz2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591Ej7Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591ES7Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591EW8Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591EX6Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591EF561521Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |