Asset retirement and environmental obligations.

No definition available.

Name:	ck0000885568_AssetRetirementAndEnvironmentalObligationsLineItems
Namespace Prefix:	ck0000885568_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Asset retirement obligations cash flow estimates related to application for additional operating license extension.

+ References

No definition available.

+ Details

Name:	ck0000885568_AssetRetirementObligationsCashFlowEstimatesRelatedToApplicationForAdditionalOperatingLicenseExtension
Namespace Prefix:	ck0000885568_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Asset retirement obligations, cash flow estimates useful life extension.

+ References

No definition available.

+ Details

Name:	ck0000885568_AssetRetirementObligationsCashFlowEstimatesUsefulLifeExtension
Namespace Prefix:	ck0000885568_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481850/410-20-50-1

+ Details

Name:	us-gaap_AssetRetirementObligationRevisionOfEstimate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of a decommissioning liability associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service. This may include operating assets such as nuclear power plants or shipping vessels.

+ References

No definition available.

+ Details

Name:	us-gaap_DecommissioningLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=ck0000885568_NorthAnnaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Accounting For Asset Retirement And Environmental Obligations - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2019	Dec. 31, 2022
Asset Retirement And Environmental Obligations [Line Items]
Increase (decrease) in asset retirement obligations		$ 37.6
North Anna [Member]
Asset Retirement And Environmental Obligations [Line Items]
North Anna's nuclear decommissioning asset retirement obligation	$ 171.2		$ 166.3
Asset retirement obligations cash flow estimates useful life	20 years
Asset retirement obligations cash flow estimates related to application for additional operating license extension	20 years