XML 112 R86.htm IDEA: XBRL DOCUMENT v3.20.4

Plant Closures (Details) - USD ($)	3 Months Ended		21 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Accelerated depreciation	$ 33,000,000	$ 225,000,000	$ 986,000,000

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

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