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Income Taxes - Tax Status of Dividends (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Capital gain distribution | 42.00%
Remaining capital gain distribution | 58.00%

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- Definition Allocation of capital gain distribution percentage. + References No definition available. + Details
Name: | reg_AllocationOfCapitalGainDistributionPercentage
Namespace Prefix: | reg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Allocation of remaining capital gain distribution percentage. + References No definition available. + Details
Name: | reg_AllocationOfRemainingCapitalGainDistributionPercentage
Namespace Prefix: | reg_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration