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Commitments And Contingent Liabilities (Environmental Matters) (Detail) | 1 Months Ended | 3 Months Ended |  |  |  |
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Jun. 30, 2008 USD ($) | Mar. 31, 2016 USD ($) Potentially_Responsible_Party entity site Station Plant mi | Dec. 31, 2015 USD ($) | Mar. 31, 2007 Potentially_Responsible_Party | Dec. 31, 2006 | Dec. 31, 2003 Potentially_Responsible_Party
Site Contingency [Line Items] |  |  |  |  |  |
Number of miles related to the Passaic River constituting a facility as determined by the US Environmental Protection Agency | mi |  | 17 |  |  |  |
Number of miles on Passaic River tidal reach required to be studied as determined by the US Environmental Protection Agency | mi |  | 8 |  |  |  |
Number of additional legal entities contacted by EPA in conjunction with Newark Bay study area contamination | entity |  | 11 |  |  |  |
Number of operating electric generating stations located on Hackensack River | Station |  | 2 |  |  |  |
Number of former MGP contamination sites located on Hackensack river in conjunction with Newark Bay study area contamination | site |  | 1 |  |  |  |
Accrued environmental costs |  | $ 423,000,000 | $ 415,000,000 |  |  |
New Salem facility cooling towers estimated cost total |  | 1,000,000,000 |  |  |  |
PSE And G [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Percentage of cost attributable to potentially responsible party |  |  |  |  | 7.00% |
Accrued environmental costs |  | $ 354,000,000 | $ 365,000,000 |  |  |
Power [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Ownership percentage of Keystone Coal fired plant in Pennsylvania |  | 23.00% |  |  |  |
New Salem facility cooling towers estimated cost total |  | $ 575,000,000 |  |  |  |
Psd Nsr Regulations Site Contingency [Member] | Power [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Penalty per day from date of violation-minimum |  | 25,000 |  |  |  |
Penalty per day from date of violation-maximum |  | $ 37,500 |  |  |  |
Pse G S Former Mgp Sites [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Number of potentially responsible parties ("PRPs") in connection with environmental liabilities for operations conducted near Passaic River | Potentially_Responsible_Party |  | 53 |  | 73 |  |
Estimated, total cost of the study |  | $ 156,000,000 |  |  |  |
Total Spend of Study to date |  | 146,000,000 |  |  |  |
Company Share of Total Spend of Study to date |  | 9,000,000 |  |  |  |
Pse G S Former Mgp Sites [Member] | Power [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Percentage of cost attributable to potentially responsible party |  |  |  |  | 1.00% |
Passaic River Site Contingency [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Estimated Cleanup Costs EPA Preferred Method |  | 2,300,000,000 |  |  |  |
Accrual for Environmental Loss Contingencies |  | 57,000,000 |  |  |  |
CPG Estimated Cleanup Costs Low Estimate |  | 518,000,000 |  |  |  |
CPG Estimated Cleanup Costs High Estimate |  | 3,200,000,000 |  |  |  |
CPG Targeted Method Cleanup Costs Low Estimate |  | 518,000,000 |  |  |  |
Number Of Additional Potentially Responsible Parties Directed By New Jersey Department Of Environmental Protection To Arrange Damage Assessment For Lower Passaic River | Potentially_Responsible_Party |  |  |  |  |  | 56
CPG Targeted Remedy Cleanup Costs High Estimate |  | 772,000,000 |  |  |  |
Estimated cleanup costs agreed to by two potentially responsible parties | $ 80,000,000 |  |  |  |  |
Estimated cost of interim natural resource injury restoration |  | $ 950,000,000 |  |  |  |
Passaic River Site Contingency [Member] | PSE And G [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Number of former generating electric station | Plant |  | 1 |  |  |  |
Number of former Manufactured Gas Plant (MGP) sites | Plant |  | 4 |  |  |  |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) |  | $ 36,000,000 |  |  |  |
Accrual for Environmental Loss Contingencies |  | 46,000,000 |  |  |  |
CPG Targeted Method Cleanup Costs Low Estimate |  | 10,000,000 |  |  |  |
Passaic River Site Contingency [Member] | Power [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Period Increase (Decrease) |  | 8,000,000 |  |  |  |
Accrual for Environmental Loss Contingencies |  | 11,000,000 |  |  |  |
CPG Targeted Method Cleanup Costs Low Estimate |  | 3,000,000 |  |  |  |
Mgp Remediation Site Contingency [Member] | PSE And G [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Accrued environmental costs |  | 434,000,000 |  |  |  |
Estimated Expenditures Low End Of Range |  | 434,000,000 |  |  |  |
Estimated Expenditures High End Of Range |  | 500,000,000 |  |  |  |
Remediation Liability Recorded As Other Current Liabilities |  | 90,000,000 |  |  |  |
Remediation Liability Recorded As Other Noncurrent Liabilities |  | 344,000,000 |  |  |  |
Regulatory Assets |  | 434,000,000 |  |  |  |
Remedial Investigation And Feasibility Study [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Estimated, total cost of the study |  | 30,000,000 |  |  |  |
Estimated Total Cost Of Study Low End of Range |  | $ 25,000,000 |  |  |  |
Passaic River mile 10.9 contaminant removal [Member] |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |
Percentage of cost attributable to potentially responsible party |  | 3.00% |  |  |  |

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