XML 51 R83.htm IDEA: XBRL DOCUMENT
v3.20.1

Revenue Customer Type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Revenue, Major Customer [Line Items] |  |  |  |
MLGW's % of operating revenues |  |  | 800.00% |
Sales of Electricity | $ 2,489 | $ 2,712 | $ 5,021 | $ 5,393
Electric revenue | 2,488 | 2,712 | 5,019 | 5,392
Off System Sales of Electricity | 1 | 0 | 2 | 1
Other revenue | 32 | 38 | 78 | 82
Revenues | 2,521 | 2,750 | 5,099 | 5,475
lpcs [Domain] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 2,301 | 2,514 | 4,658 | 4,981
industries directly served [Domain] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 160 | 168 | 310 | 353
federal agencies and other [Domain] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 28 | 30 | 53 | 59
ALABAMA |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 360 | 387 | 729 | 779
GEORGIA |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 64 | 70 | 127 | 137
KENTUCKY |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 158 | 173 | 315 | 341
MISSISSIPPI |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 227 | 249 | 464 | 501
NORTH CAROLINA |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 19 | 21 | 37 | 41
TENNESSEE |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | 1,648 | 1,799 | 3,324 | 3,568
VIRGINIA |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Electric revenue | $ 12 | $ 13 | $ 23 | $ 25

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 MLGW's % of operating revenues + References No definition available. + Details
Name: | tve_MLGWsofoperatingrevenues
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
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 Other revenue + References No definition available. + Details
Name: | tve_Otherrevenue
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- 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
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_MajorCustomersAxis=tve_LpcsDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=tve_IndustriesdirectlyservedDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=tve_FederalagenciesandotherDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |