XML 95 R61.htm IDEA: XBRL DOCUMENT v3.25.1

Plant Closures (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended	27 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2025
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 475	$ 450	$ 945	$ 902
Kingston
Property, Plant and Equipment [Line Items]
Accelerated depreciation					$ 9
Accumulated additional depreciation					$ 36
Cumberland
Property, Plant and Equipment [Line Items]
Accelerated depreciation	$ 16
Accumulated additional depreciation						$ 144

X

- Definition

Accelerated depreciation

+ References

No definition available.

+ Details

Name:	tve_AcceleratedDepreciation
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Accumulated additional depreciation

+ References

No definition available.

+ Details

Name:	tve_AccumulatedAdditionalDepreciation
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=tve_KingstonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=tve_CumberlandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: