Document And Entity Information	12 Months Ended
	Dec. 31, 2023 USD ($) shares
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Registrant Name	OLD DOMINION ELECTRIC COOPERATIVE
Entity Central Index Key	0000885568
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding | shares	0
Entity Well-known Seasoned Issuer	No
Entity Public Float | $	$ 0
Entity Current Reporting Status	No
Entity Voluntary Filers	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes
Entity File Number	000-50039
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	23-7048405
Entity Address, Address Line One	4201 Dominion Boulevard
Entity Address, City or Town	Glen Allen
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	23060
City Area Code	(804)
Local Phone Number	747-0592
Document Annual Report	true
Document Transition Report	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Documents Incorporated by Reference	NONE
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Richmond, Virginia