Name:	fhlbcin_FairValueOptionAggregateDifferencesConsolidatedObligationBonds
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

This item represents the gain (loss) brought about by the difference between the aggregate fair value and the aggregate unpaid principal balance of Consolidated Obligations Discount Notes that have contractual principal amounts and for which the fair value option has been elected.

No definition available.

Name:	fhlbcin_FairValueOptionAggregateDifferencesConsolidatedObligationDiscountNotes
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the outstanding amount of the unpaid principal balance of Federal Home Loan Bank Advances for which the fair value option has been elected.

No definition available.

Name:	fhlbcin_FairValueOptionPrincipalBalanceAdvances
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the outstanding amount of the unpaid principal balance of Consolidated Obligation Bonds for which the fair option has been elected.

No definition available.

Name:	fhlbcin_FairValueOptionPrincipalBalanceConsolidatedObligationBonds
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the outstanding amount of the unpaid principal balance of Consolidated Obligation Discount Notes for which the fair option has been elected.

No definition available.

Name:	fhlbcin_FairValueOptionPrincipalBalanceConsolidatedObligationDiscountNotes
Namespace Prefix:	fhlbcin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Fair value of Federal Home Loan Bank (FHLBank) advances carried under the fair value option.

No definition available.

Name:	us-gaap_AdvancesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

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

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-32

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

Amount of accumulated increase (decrease) on advances made and reported by Federal Home Loan Bank (FHLBank) from fair value option adjustments.

No definition available.

Name:	us-gaap_FederalHomeLoanBankAdvancesValuationAdjustmentsUnderFairValueOption
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

No definition available.