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Financing Receivables (Schedule Of Assets Under Lease Receivables) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 MW
Powerton Station Units 5 And 6 [Member] |
Property, Plant and Equipment [Line Items] |
Lease Receivable, Asset Location | IL
Lease Receivable, Gross Investment | $ 134 pseg_LeaseReceivableGrossInvestment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_PowertonStationMember
Lease Receivable Percent Owned | 64.00%pseg_LeaseReceivablePercentOwned / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_PowertonStationMember
Lease Receivable, Total, MW | 1,538 pseg_LeaseReceivableAssetCapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_PowertonStationMember
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | BB-
Lease Receivable, Counterparty | NRG Energy, Inc.
Joliet Station Units 7 And 8 [Member] |
Property, Plant and Equipment [Line Items] |
Lease Receivable, Asset Location | IL
Lease Receivable, Gross Investment | 84 pseg_LeaseReceivableGrossInvestment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_JolietStationMember
Lease Receivable Percent Owned | 64.00%pseg_LeaseReceivablePercentOwned / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_JolietStationMember
Lease Receivable, Total, MW | 1,044 pseg_LeaseReceivableAssetCapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_JolietStationMember
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | BB-
Lease Receivable, Counterparty | NRG Energy, Inc.
Keystone Station Units 1 And 2 [Member] |
Property, Plant and Equipment [Line Items] |
Lease Receivable, Asset Location | PA
Lease Receivable, Gross Investment | 121 pseg_LeaseReceivableGrossInvestment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_KeystoneStationMember
Lease Receivable Percent Owned | 17.00%pseg_LeaseReceivablePercentOwned / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_KeystoneStationMember
Lease Receivable, Total, MW | 1,711 pseg_LeaseReceivableAssetCapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_KeystoneStationMember
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | B-
Lease Receivable, Counterparty | NRG REMA LLC
Conemaugh Station Units 1 And 2 [Member] |
Property, Plant and Equipment [Line Items] |
Lease Receivable, Asset Location | PA
Lease Receivable, Gross Investment | 121 pseg_LeaseReceivableGrossInvestment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_ConemaughStationMember
Lease Receivable Percent Owned | 17.00%pseg_LeaseReceivablePercentOwned / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_ConemaughStationMember
Lease Receivable, Total, MW | 1,711 pseg_LeaseReceivableAssetCapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_ConemaughStationMember
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | B-
Lease Receivable, Counterparty | NRG REMA LLC
Shawville Station Units 1, 2, 3 And 4 [Member] |
Property, Plant and Equipment [Line Items] |
Lease Receivable, Asset Location | PA
Lease Receivable, Gross Investment | $ 113 pseg_LeaseReceivableGrossInvestment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_ShawvilleStationMember
Lease Receivable Percent Owned | 100.00%pseg_LeaseReceivablePercentOwned / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_ShawvilleStationMember
Lease Receivable, Total, MW | 603 pseg_LeaseReceivableAssetCapacity / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_ShawvilleStationMember
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | B-
Lease Receivable, Counterparty | NRG REMA LLC

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- Definition Lease Receivable, Asset Capacity + References No definition available. + Details
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Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

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- Definition Lease Receivable, Asset, Fuel Type + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease Receivable, Asset Location + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease receivable counterparties credit ratings + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Lease Receivable, Counterparty + References No definition available. + Details
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- Definition Lease Receivable, Gross Investment + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Lease Receivable, Percent Owned + References No definition available. + Details
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Namespace Prefix: | pseg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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

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

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