Liquidity Resources - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Member distribution cooperatives, amount prepaid	$ 92,300,000	$ 57,200,000
Member distribution cooperatives, amount extended	$ 0	$ 6,500,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, interest rate	1.10%	1.10%
Line of credit outstanding	$ 0	$ 0
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Margins-for-interest ratio	110.00%
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt to capitalization ratio	85.00%
Revolving Credit Facility [Member] \| LIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Spread on variable rate	0.90%
Revolving Credit Facility [Member] \| LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Spread on variable rate	1.50%
Revolving Credit Facility [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument [Line Items]
Spread on variable rate	0.50%
Revolving Credit Facility [Member] \| Daily LIBOR [Member]
Debt Instrument [Line Items]
Spread on variable rate	1.00%
Revolving Credit Facility [Member] \| Daily LIBOR [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Spread on variable rate margin	0.00%
Revolving Credit Facility [Member] \| Daily LIBOR [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Spread on variable rate margin	0.50%
Revolving Credit Facility [Member] \| Through March 3, 2022
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 500,000,000
Revolving Credit Facility [Member] \| March 4, 2022 through February 28, 2025
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	400,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit outstanding	$ 500,000	$ 500,000

Accounts Payable, Member Prepayment

No definition available.

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Namespace Prefix:	cik885568_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Accounts Receivable Members, Extended Payment

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Basis Spread on Variable Rate Margin

+ References

No definition available.

+ Details

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- Definition

Debt to Capitalization Ratio

+ References

No definition available.

+ Details

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- Definition

Margins-for-Interest Ratio

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- 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

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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- Definition

The effective interest rate during the reporting period.

+ References

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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