XML 111 R88.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
State [Line Items] |  |  |  |
Electric revenue | $ (3,091) | $ (2,921) | $ (5,823) | $ (5,880)
Off System Sales of Electricity | 2 |  | 4 | 7
Regulated and Unregulated Operating Revenue | $ 3,154 | 2,959 | $ 5,919 | 5,974
Total long duration contract revenue recognition | 2,842 |  | 5,329 |
Off system sales |  | 3 |  |
Percent of wholesale Credit offered |  |  | 310.00% |
Percent of Generation Flexibility Credit |  |  | 5.00% |
Pre-commercial Ops - capitalized revenue | $ 0 | 0 | $ (3) | 0
Regulated Operating Revenue | 3,093 | 2,924 | $ 5,824 | 5,887
NES's % of operating revenues |  |  | 800.00% |
Percent of Generation Flexibility Credit |  |  | 5.00% |
ALABAMA |  |  |  |
State [Line Items] |  |  |  |
Regulated Operating Revenue | 457 | 428 | $ 865 | 856
GEORGIA |  |  |  |
State [Line Items] |  |  |  |
Regulated Operating Revenue | 80 | 72 | 149 | 148
KENTUCKY |  |  |  |
State [Line Items] |  |  |  |
Regulated Operating Revenue | 201 | 192 | 378 | 390
MISSISSIPPI |  |  |  |
State [Line Items] |  |  |  |
Regulated Operating Revenue | 284 | 273 | 539 | 551
NORTH CAROLINA |  |  |  |
State [Line Items] |  |  |  |
Regulated Operating Revenue | 28 | 25 | 51 | 50
TENNESSEE |  |  |  |
State [Line Items] |  |  |  |
Regulated Operating Revenue | 2,027 | 1,918 | 3,816 | 3,859
VIRGINIA |  |  |  |
State [Line Items] |  |  |  |
Regulated Operating Revenue | $ 14 | $ 13 | $ 25 | $ 26

X
- Definition Revenue from sales of electricity + References No definition available. + Details
Name: | tve_Electricrevenue
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition NES's % of operating revenues + References No definition available. + Details
Name: | tve_NESsOfOperatingRevenues
Namespace Prefix: | tve_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Off system sales + References No definition available. + Details
Name: | tve_OffSystemSales
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Off System Sales of Electricity + References No definition available. + Details
Name: | tve_OffSystemSalesofElectricity
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percent of Generation Flexibility Credit + References No definition available. + Details
Name: | tve_PercentOfGenerationFlexibilityCredit
Namespace Prefix: | tve_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of wholesale Credit offered + References No definition available. + Details
Name: | tve_PercentOfWholesaleCreditOffered
Namespace Prefix: | tve_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pre-commercial Ops - capitalized revenue + References No definition available. + Details
Name: | tve_PreCommercialOpsCapitalizedRevenue
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition [Line Items] for State [Table] + References No definition available. + Details
Name: | tve_StateLineItems
Namespace Prefix: | tve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total long duration contract revenue recognition + References No definition available. + Details
Name: | tve_Totallongdurationcontractrevenuerecognition
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of operating revenues recognized during the period. + References No definition available. + Details
Name: | us-gaap_RegulatedAndUnregulatedOperatingRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of regulated operating revenues recognized during the period. + References No definition available. + Details
Name: | us-gaap_RegulatedOperatingRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_GeographicDistributionAxis=stpr_AL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=stpr_GA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=stpr_KY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=stpr_MS
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=stpr_NC
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=stpr_TN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GeographicDistributionAxis=stpr_VA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |