XML 141 R85.htm IDEA: XBRL DOCUMENT
v3.25.3

Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024
Short-term debt |  |  |
Short-term debt, net of discounts |  | $ 0 | $ 1,167
Current maturities of long-term debt of variable interest entities issued at par |  | 49 | 37
Total Current maturities of power bonds issued at par |  | 1,370 | 1,022
Total current debt outstanding, net |  | 1,419 | 2,226
Long-term debt |  |  |
Long-term power bonds, net |  | 20,461 | 17,867
Long-term power bonds | [1] | 20,628 | 17,995
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | (167) | (128)
Long-term debt of variable interest entities, net |  | 1,632 | 897
Total long-term debt, net |  | $ 22,093 | 18,764
880591DX7 |  |  |
Short-term debt |  |  |
Coupon rate |  | 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 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 96 | 116
880591CJ9 |  |  |
Short-term debt |  |  |
Coupon rate |  | 6.75% |
Debt Instrument, Maturity Date |  | Nov. 01, 2025 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 0 | 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 | 335
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 | 201
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 |  | 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
880591EX6 |  |  |
Short-term debt |  |  |
Coupon rate |  | 1.50% |
Debt Instrument, Maturity Date |  | Sep. 15, 2031 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 500 | 500
880591EY4 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.25% |
Debt Instrument, Maturity Date |  | Sep. 15, 2052 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 500 | 500
880591EZ1 |  |  |
Short-term debt |  |  |
Coupon rate |  | 3.875% |
Debt Instrument, Maturity Date |  | Mar. 15, 2028 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591FB3 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.375% |
Debt Instrument, Maturity Date |  | Aug. 01, 2034 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,000 | 1,000
880591FE7 |  |  |
Short-term debt |  |  |
Coupon rate |  | 3.875% |
Debt Instrument, Maturity Date |  | Aug. 01, 2030 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,250 | 0
880591FD9 |  |  |
Short-term debt |  |  |
Coupon rate |  | 4.875% |
Debt Instrument, Maturity Date |  | May 15, 2035 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,500 | 0
880591FC1 |  |  |
Short-term debt |  |  |
Coupon rate |  | 5.25% |
Debt Instrument, Maturity Date |  | Feb. 01, 2055 |
Long-term debt |  |  |
Long-term power bonds, net |  | $ 1,250 | $ 0
[1] | nclude total net exchange gain from currency transactions of $59 million and $62 million at September 30, 2025 and 2024

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://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + 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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + 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 -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482949/835-30-55-8 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482900/835-30-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-1A + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + 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 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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 + 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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 + 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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 + 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + 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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + 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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + 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_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_A880591EX6Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591EY4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591EZ1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591FB3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591FE7Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591FD9Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=tve_A880591FC1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |