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Commitments And Contingent Liabilities (Regulatory Proceedings and Superstorm Sandy) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 30 Months Ended | 39 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Clean Energy Program, current portion | $ 185 |  |  |  | $ 185 |  |  |  |  |  | $ 142
Operation and Maintenance | 746 |  |  | $ 714 | 2,170 | $ 2,370 |  |  |  |  |
Insurance Recovery |  |  |  |  | 28 |  |  |  |  |  |
New Jersey Clean Energy Program Regulatory Action [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate funding level for fiscal year 2016 for New Jersey Clean Energy Program | 345 |  |  |  | 345 |  |  |  |  |  |
Superstorm Sandy [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Insurance Recoveries |  | $ 55 | $ 159 |  | 214 |  |  |  | $ 264 |  |
PSE And G [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Clean Energy Program, current portion | 185 |  |  |  | 185 |  |  |  |  |  | $ 142
Operation and Maintenance | 391 |  |  | 366 | 1,171 | 1,190 |  |  |  |  |
Insurance Recovery |  |  |  |  | 0 |  |  |  |  |  |
PSE And G [Member] | New Jersey Clean Energy Program Regulatory Action [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate funding level for fiscal year 2016 for New Jersey Clean Energy Program | 200 |  |  |  | 200 |  |  |  |  |  |
Clean Energy Program, current portion | 185 |  |  |  | 185 |  |  |  |  |  |
PSE And G [Member] | Superstorm Sandy [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Utilities, Costs Incurred to Repair Infrastructure to Pre-Storm Conditions |  |  |  |  |  |  |  | $ 5 |  |  |
Utilities, Costs Incurred to Restore Service portion attributable to insured property |  |  |  |  |  |  |  | 36 |  |  |
Utilities, Costs Incurred to Restore Service |  |  |  |  |  |  |  | 295 |  |  |
Operation and Maintenance |  |  |  |  | (10) |  |  | 40 |  |  |
Proceeds from Insurance Recoveries |  |  |  |  | 35 |  |  | 6 |  |  |
Public Utilities, Property, Plant and Equipment, Addition from Service Restore |  |  |  |  | 11 |  |  | (75) |  |  |
Regulatory Assets, Addition for Service Restore |  |  |  |  | 20 |  |  | $ (180) |  |  |
Power [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operation and Maintenance | $ 263 |  |  | $ 242 | 748 | 871 |  |  |  |  |
Insurance Recovery |  |  |  |  | 28 |  |  |  |  |  |
Power [Member] | FERC Compliance [Domain] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss Contingency related to bidding errors |  |  |  |  |  | $ 25 |  |  |  |  |
Power [Member] | Superstorm Sandy [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operation and Maintenance |  |  |  |  | 2 |  |  |  |  | $ 193 |
Proceeds from Insurance Recoveries |  |  |  |  | 179 |  | $ 44 |  |  |  |
Insurance Recovery |  |  |  |  | 145 |  |  |  |  |  |
Property, Plant and Equipment [Member] | Power [Member] | Superstorm Sandy [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Insurance Recovery |  |  |  |  | 6 |  |  |  |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Insurance Recovery |  |  |  |  | $ 28 |  |  |  |  |  |

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