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Commitments And Contingent Liabilities (Environmental Matters) (Detail) | 1 Months Ended | 12 Months Ended |  |  |  |
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Jun. 30, 2008 USD ($) | Dec. 31, 2015 USD ($) Potentially_Responsible_Party site entity Station Plant mi | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2015 USD ($) | Mar. 31, 2007 Potentially_Responsible_Party | Dec. 31, 2006 | Dec. 31, 2003 Potentially_Responsible_Party
Site Contingency [Line Items] |  |  |  |  |  |  |  |
Percentage of residential gas supply permitted to be recovered in gas hedging by BPU |  | 80.00% |  |  |  |  |  |
Number of miles related to the Passaic River constituting a facility as determined by the US Environmental Protection Agency | mi |  | 17 |  |  |  |  |  |
Number Of Miles Pertaining To Passaic River Tidal Reach Required To Be Studied By Epa | mi |  | 8 |  |  |  |  |  |
Number of 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 |  | $ 415,000,000 | $ 417,000,000 |  |  |  |  |
New Salem facility cooling towers estimated cost total |  | 1,000,000,000 |  |  |  |  |  |
Operation and Maintenance |  | 2,978,000,000 | 3,150,000,000 | $ 2,887,000,000 |  |  |  |
New England Generation Fleet |  | 11,842,000,000 | 11,153,000,000 |  |  |  |  |
Clean Energy Program Current |  | 142,000,000 | 142,000,000 |  |  |  |  |
PSE&G [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
Percentage Of Cost Attributable To Potentially Responsible Party |  |  |  |  |  |  | 7.00% |
Accrued environmental costs |  | 365,000,000 | 364,000,000 |  |  |  |  |
Regulatory assets |  | 3,360,000,000 | 3,764,000,000 |  |  |  |  |
Operation and Maintenance |  | 1,560,000,000 | 1,558,000,000 | 1,639,000,000 |  |  |  |
New England Generation Fleet |  | 569,000,000 | 521,000,000 |  |  |  |  |
Clean Energy Program Current |  | $ 142,000,000 | 142,000,000 |  |  |  |  |
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 |  |  |  |  |  |
Operation and Maintenance |  | 1,057,000,000 | 1,186,000,000 | $ 1,224,000,000 |  |  |  |
New England Generation Fleet |  | 11,273,000,000 | $ 10,632,000,000 |  |  |  |  |
New Jersey Clean Energy Program Unfavorable Regulatory Action [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 345,000,000 |  |  |  |  |  |
New Jersey Clean Energy Program Unfavorable Regulatory Action [Member] | PSE&G [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 200,000,000 |  |  |  |  |  |
Clean Energy Program Current |  | 142,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |
MGP Remediation Site Contingency [Member] | PSE&G [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
Estimated expenditures, low end of range |  | 431,000,000 |  |  |  |  |  |
Estimated expenditures, high end of range |  | 499,000,000 |  |  |  |  |  |
Accrued environmental costs |  | 431,000,000 |  |  |  |  |  |
Remediation liability recorded as other current liabilities |  | 76,000,000 |  |  |  |  |  |
Remediation liability recorded as environmental costs in noncurrent liabilities |  | 355,000,000 |  |  |  |  |  |
Regulatory assets |  | 431,000,000 |  |  |  |  |  |
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% |  |  |  |  |  |
PSE&G's Former MGP Sites [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
Estimated, total cost of the study |  | $ 163,000,000 |  |  |  |  |  |
Number Of Potentially Responsible Parties In Connection With Environmental Liabilities For Operations Conducted Near Passaic River | Potentially_Responsible_Party |  | 54 |  |  |  | 73 |  |
Number of MGP sites identified by registrant and the NJDEP requiring some level of remedial action | site |  | 38 |  |  |  |  |  |
Total Spend of Study to date |  | $ 147,000,000 |  |  |  |  |  |
Company Share of Total Spend of Study to date |  | 10,000,000 |  |  |  |  |  |
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-low estimate |  | 365,000,000 |  |  |  |  |  |
Estimated cleanup costs-high estimate |  | 3,250,000,000 |  |  |  |  |  |
Estimated Cleanup Costs EPA Preferred Method |  | 1,700,000,000 |  |  |  |  |  |
Estimated cleanup costs agreed to by two potentially responsible parties | $ 80,000,000 |  |  |  |  |  |  |
Aggregate number of PRPs directed by the NJDEP to arrange for natural resource damage assessment and interim compensatory restoration along the lower Passaic River | Potentially_Responsible_Party |  |  |  |  |  |  |  | 56
Estimated cost of interim natural resource injury restoration |  | 950,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |
CPG Targeted Remedy Cleanup Costs High Estimate |  | $ 772,000,000 |  |  |  |  |  |
Passaic River Site Contingency [Member] | Transferred To Power From PSE&G [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
Number of operating electric generating station (Essex Site) | Plant |  | 1 |  |  |  |  |  |
Passaic River Site Contingency [Member] | PSE&G [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
Number of former generating electric station | Plant |  | 1 |  |  |  |  |  |
Number of former Manufactured Gas Plant (MGP) sites | Plant |  | 4 |  |  |  |  |  |
CPG Targeted Method Cleanup Costs Low Estimate |  | $ 10,000,000 |  |  |  |  |  |
Passaic River Site Contingency [Member] | Power [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
CPG Targeted Method Cleanup Costs Low Estimate |  | $ 3,000,000 |  |  |  |  |  |
New England Fleet [Member] | Power [Member] |  |  |  |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |  |  |  |
New England Generation Fleet |  |  |  |  | $ 210,000,000 |  |  |

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