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Commitments And Contingent Liabilities (Environmental Matters) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Potentially_Responsible_Party site entity Station Plant mi | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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 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 | $ 357 | $ 401 |
Operation and Maintenance | 2,869 | 3,008 | $ 2,978
New England Generation Fleet | 12,250 | 13,156 |
Clean Energy Program Current | $ 128 | 142 |
PSE&G [Member] |  |  |
Site Contingency [Line Items] |  |  |
Percentage Of Cost Attributable To Potentially Responsible Party | 7.60% |  |
Accrued environmental costs | $ 283 | 332 |
Regulatory Assets | 3,433 | 3,518 |
Operation and Maintenance | 1,434 | 1,475 | 1,560
New England Generation Fleet | 593 | 591 |
Clean Energy Program Current | 128 | 142 |
Power [Member] |  |  |
Site Contingency [Line Items] |  |  |
Operation and Maintenance | 1,038 | 1,143 | $ 1,057
New England Generation Fleet | 11,657 | $ 12,565 |
MGP Remediation Site Contingency [Member] | PSE&G [Member] |  |  |
Site Contingency [Line Items] |  |  |
Remediation liability recorded as other current liabilities | 79 |  |
Remediation liability recorded as environmental costs in noncurrent liabilities | 279 |  |
Regulatory Assets | $ 358 |  |
PSE&G's Former MGP Sites [Member] |  |  |
Site Contingency [Line Items] |  |  |
Number of MGP sites identified by registrant and the NJDEP requiring some level of remedial action | site | 38 |  |
PSE&G's Former MGP Sites [Member] | Power [Member] |  |  |
Site Contingency [Line Items] |  |  |
Percentage Of Cost Attributable To Potentially Responsible Party | 1.90% |  |
Passaic River Site Contingency [Member] |  |  |
Site Contingency [Line Items] |  |  |
Estimated Cleanup Costs EPA Preferred Method | $ 2,300 |  |
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 |  |
Accrual for Environmental Loss Contingencies | $ 57 |  |
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 |  |
Accrual for Environmental Loss Contingencies | $ 46 |  |
Passaic River Site Contingency [Member] | Power [Member] |  |  |
Site Contingency [Line Items] |  |  |
Accrual for Environmental Loss Contingencies | 11 |  |
PennEast Natural Gas Pipeline [Member] | Power [Member] |  |  |
Site Contingency [Line Items] |  |  |
Terminated Guarantee | 106 |  |
Minimum [Member] | MGP Remediation Site Contingency [Member] | PSE&G [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | 358 |  |
Accrual for Environmental Loss Contingencies | 358 |  |
Minimum [Member] | Passaic River Site Contingency [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | 518 |  |
Maximum [Member] | MGP Remediation Site Contingency [Member] | PSE&G [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | 403 |  |
Maximum [Member] | Passaic River Site Contingency [Member] |  |  |
Site Contingency [Line Items] |  |  |
Loss Contingency, Estimate of Possible Loss | $ 3,200 |  |

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