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Commitments And Contingent Liabilities (Environmental Matters) (Detail) $ in Millions | Mar. 31, 2018 USD ($) Potentially_Responsible_Party entity site Station Plant mi | Dec. 31, 2017 mi
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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 | 17
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 |
PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Percentage of cost attributable to potentially responsible party | 7.60% |
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 |
Accrual for Environmental Loss Contingencies | $ 57 |
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 |
Estimated cost of interim natural resource injury restoration | $ 950 |
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 | $ 46 |
Passaic River Site Contingency [Member] | Power [Member] |  |
Site Contingency [Line Items] |  |
Accrual for Environmental Loss Contingencies | 11 |
Mgp Remediation Site Contingency [Member] | PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Remediation Liability Recorded As Other Current Liabilities | 79 |
Remediation Liability Recorded As Other Noncurrent Liabilities | 266 |
Regulatory Assets | 345 |
Minimum [Member] | Passaic River Site Contingency [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 518 |
Minimum [Member] | Mgp Remediation Site Contingency [Member] | PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 345 |
Accrual for Environmental Loss Contingencies | 345 |
Maximum [Member] | Passaic River Site Contingency [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 3,200 |
Maximum [Member] | Mgp Remediation Site Contingency [Member] | PSE And G [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 391 |

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