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Schedule of Debt Net of Unamortized Debt Premium (Discount) and Debt Issuance Costs (Parentheticals) (Details) - Variable Rate Mortgage Loans [Member] - London Interbank Offered Rate (LIBOR) [Member] | Mar. 31, 2021
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Minimum [Member] |
Debt Instrument [Line Items] |
Debt instrument, effective fixed interest rate | 2.50%
Maximum [Member] |
Debt Instrument [Line Items] |
Debt instrument, effective fixed interest rate | 4.10%

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- Definition Debt Effective Fixed Rate. + References No definition available. + Details
Name: | reg_DebtEffectiveFixedRate
Namespace Prefix: | reg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=reg_VariableRateMortgageLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |