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Leases Leases (Details) - PSEG Power [Member] $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Operating Lease Right-of-Use Assets, reduction due to asset sale | $ 33
Operating Lease Liability, reduction due to asset sale | $ 33

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- Definition Operating Lease Liability, reduction due to asset sale + References No definition available. + Details
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Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Lease Right-of-Use Assets, reduction due to asset sale + References No definition available. + Details
Name: | pseg_OperatingLeaseRightOfUseAssetsReductionDueToAssetSale
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pseg_PSEGPowerLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |