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Financing Receivables (Schedule Of Assets Under Lease Receivables) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Shawville Station [Member] |
Financing Receivable, Recorded Investment [Line Items] |
Lease Receivable, Counterparties' S&P Credit Ratings | BB+
Merrill Creek Reservoir [Member] |
Financing Receivable, Recorded Investment [Line Items] |
Lease Receivable, Gross Investment | $ 26
Lease Receivable, Counterparty | Metropolitan Edison Company (a subsidiary of First Energy)

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- Definition Lease receivable counterparties credit ratings + References No definition available. + Details
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Namespace Prefix: | pseg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease Receivable, Counterparty + References No definition available. + Details
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Namespace Prefix: | pseg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease Receivable, Gross Investment + References No definition available. + Details
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Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=pseg_MerrillCreekReservoirMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |