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Available-For-Sale Securities (Schedule Of Accounts Receivable And Accounts Payable) (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Accounts Receivable | $ 11 us-gaap_AccountsReceivableNet / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember | $ 10 us-gaap_AccountsReceivableNet / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember
Accounts Payable | (7)us-gaap_AccountsPayableCurrentAndNoncurrent / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember | (2)us-gaap_AccountsPayableCurrentAndNoncurrent / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember
Rabbi Trust [Member] |  |
Accounts Receivable | 1 us-gaap_AccountsReceivableNet / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember | 1 us-gaap_AccountsReceivableNet / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember
Accounts Payable | $ (1)us-gaap_AccountsPayableCurrentAndNoncurrent / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember | $ 0 us-gaap_AccountsPayableCurrentAndNoncurrent / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_AccountsReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | pseg_AvailableForSaleSecuritiesTypeOfTrustAxis=pseg_NuclearDecommissioningTrustNdtFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pseg_AvailableForSaleSecuritiesTypeOfTrustAxis=pseg_RabbiTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |