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Commitments And Contingent Liabilities (Guaranteed Obligations) (Detail) - PSEG Power [Member] - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Loss Contingencies [Line Items] |  |
Face Value of Outstanding Guarantees | $ 1,828 | $ 1,854
Exposure under Current Guarantees | 86 | 171
Letters of Credit Margin Posted | 135 | 121
Letters of Credit Margin Received | 42 | 29
Counterparty Cash Collateral Deposited | 0 | 0
Counterparty Cash Collateral Received | (1) | (4)
Net Broker Balance Deposited (Received) | 57 | 48
Other Letters of Credit | $ 52 | $ 82

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- Definition Additional Amounts Posted Other Letters of Credit + 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 Counterparty Cash Margin Deposited + References No definition available. + Details
Name: | pseg_CounterpartyCashMarginDeposited
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Counterparty Cash Margin Received + References No definition available. + Details
Name: | pseg_CounterpartyCashMarginReceived
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Exposure under Current Guarantees + References No definition available. + Details
Name: | pseg_ExposureUnderCurrentGuarantees
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Letters of Credit Margin Posted + References No definition available. + Details
Name: | pseg_LettersOfCreditMarginPosted
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Letters of Credit Margin Received + References No definition available. + Details
Name: | pseg_LettersOfCreditMarginReceived
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Net Broker Balance Received + 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 Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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_
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Balance Type: | na
Period Type: | duration

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