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Financial Information By Business Segments (Financial Information By Business Segments) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | $ 3,135 us-gaap_Revenues |  | $ 3,223 us-gaap_Revenues |  |  |
Net Income (Loss) | 586 us-gaap_NetIncomeLoss |  | 386 us-gaap_NetIncomeLoss |  |  |
Total Assets | 35,827 us-gaap_Assets |  |  |  | 35,333 us-gaap_Assets |
Power [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 1,725 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |  | 1,700 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |  |  |
Net Income (Loss) | 335 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |  | 164 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |  |  |
Property, Plant and Equipment, Additions | 139 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |  | 126 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |  |  |
Total Assets | 12,220 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |  |  |  | 12,046 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |
Investments in Equity Method Subsidiaries | 119 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |  |  |  | 121 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = pseg_PowerMember |
PSE And G [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 2,002 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |  | 2,145 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |  |  |
Net Income (Loss) | 242 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |  | 214 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |  |  |
Property, Plant and Equipment, Additions | 599 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |  | 481 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |  |  |
Total Assets | 22,345 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |  |  |  | 22,223 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |
Investments in Equity Method Subsidiaries | 0 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |  |  |  | 0 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = pseg_PseAndGMember |
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 98 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] | 105 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] |  |
Net Income (Loss) | 9 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] | 8 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] |  |
Property, Plant and Equipment, Additions | 9 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] | 2 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] |  |
Total Assets | 3,168 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] |  |  | 2,799 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1]
Investments in Equity Method Subsidiaries | 2 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] |  |  | 2 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1]
Eliminations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | (690)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2] | (727)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2] |  |
Net Income (Loss) | 0 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2] |  |  |  |
Property, Plant and Equipment, Additions | 0 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2] | 0 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2] |  |
Total Assets | (1,906)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2] |  |  | (1,735)us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2]
Investments in Equity Method Subsidiaries | 0 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2] |  |  | 0 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | [2]
Consolidated [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenues | 3,135 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |  | 3,223 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |  |  |
Net Income (Loss) | 586 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |  | 386 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |  |  |
Property, Plant and Equipment, Additions | 747 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |  | 609 us-gaap_PropertyPlantAndEquipmentAdditions / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |  |  |
Total Assets | 35,827 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |  |  |  | 35,333 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |
Investments in Equity Method Subsidiaries | $ 121 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |  |  |  | $ 123 pseg_SegmentReportingInvestmentsInEquityMethodSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = pseg_ConsolidatedMember |
[1] | Includes amounts applicable to Energy Holdings and PSEG LI, which are below the quantitative threshold for separate disclosure as reportable segments. Other also includes amounts applicable to PSEG (parent corporation) and Services.
[2] | Intercompany eliminations, primarily related to intercompany transactions between PSE&G and Power. No gains or losses are recorded on any intercompany transactions; rather, all intercompany transactions are at cost or, in the case of the BGS and BGSS contracts between PSE&G and Power, at rates prescribed by the BPU. For a further discussion of the intercompany transactions between PSE&G and Power, see Note 17. Related-Party Transactions.

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