Wholesale Power Contracts - (Summary of Removal of Load Requirements Under Exception) (Details) - MW	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Wholesale Power Contracts [Abstract]
Removal of load requirements under exception	140	111	108

Power received under limited exception to wholesale power contract, amount of power received from owned generation or other suppliers MW.

No definition available.

Name:	cik885568_PowerReceivedUnderLimitedExceptionToWholesalePowerContractAmountOfPowerReceivedFromOwnedGenerationOrOtherSuppliersMW
Namespace Prefix:	cik885568_
Data Type:	dtr-types:powerItemType
Balance Type:	na
Period Type:	duration