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Real Estate Investments Business Acquisitions (Parenthetical) (Details) - a | Sep. 30, 2020 | Sep. 30, 2019
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Country Walk Plaza [Member] |  |
Business Acquisition [Line Items] |  |
Percentage of purchase price of property | 100.00% |
Percentage of equity interest acquired prior | 30.00% |
Pablo Plaza [Member] |  |
Business Acquisition [Line Items] |  |
Purchase of building for redevelopment |  | 0.17

X
- Definition Percentage of equity interest acquired. + References No definition available. + Details
Name: | reg_PercentageOfEquityInterestAcquired
Namespace Prefix: | reg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of purchase price of property. + References No definition available. + Details
Name: | reg_PercentageOfPurchasePriceOfProperty
Namespace Prefix: | reg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=reg_CountryWalkPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=reg_PabloPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |