XML 69 R54.htm IDEA: XBRL DOCUMENT
v3.22.4

Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Line Items] |  |  |
Approximate amount by which basis of assets and liabilities for tax reporting purposes is higher (lower) than amount reported on consolidated balance sheet | $ (7) |  |
Common Shares |  |  |
Income Tax Disclosure [Line Items] |  |  |
Ordinary income | 68.20% | 33.30% | 45.10%
Long-term capital gain | 31.80% | 57.30% | 54.90%
Return of capital | 0.00% | 9.40% | 0.00%

X
- Definition Represents the approximate amount by which basis of assets and liabilities for tax reporting purposes are higher (lower) than the amount reported on consolidated balance sheet. + References No definition available. + Details
Name: | ofc_ApproximateAmountbywhichNetBasisofAssetsandLiabilitiesforTaxReportingPurposesisHigherLowerthanAmountReportedonConsolidatedBalanceSheet
Namespace Prefix: | ofc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Dividends Declared Long Term Capital Gain Percentage + References No definition available. + Details
Name: | ofc_DividendsDeclaredLongTermCapitalGainPercentage
Namespace Prefix: | ofc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of aggregate dividends declared during the period treated as ordinary income for federal tax purposes. + References No definition available. + Details
Name: | ofc_DividendsDeclaredOrdinaryIncomePercentage
Namespace Prefix: | ofc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of aggregate dividends declared during the period treated as return of capital for federal tax purposes. + References No definition available. + Details
Name: | ofc_DividendsDeclaredReturnOfCapitalPercentage
Namespace Prefix: | ofc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Income Tax Disclosure [Table] + References No definition available. + Details
Name: | ofc_IncomeTaxDisclosureTableLineItems
Namespace Prefix: | ofc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |