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Commitments And Contingent Liabilities (Environmental Matters) (Detail) $ in Millions | Dec. 31, 2019 USD ($) Potentially_Responsible_Party site entity Plant mi | Dec. 31, 2018 USD ($)
--- | --- | ---
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 |
Accrued environmental costs | $ 349 | $ 327
Clean Energy Program Current | 143 | 143
Public Service Electric and Gas Company |  |
Site Contingency [Line Items] |  |
Accrued environmental costs | 294 | 268
Regulatory Assets | 4,028 | 3,788
Clean Energy Program Current | 143 | $ 143
MGP Remediation Site Contingency [Member] | Public Service Electric and Gas Company |  |
Site Contingency [Line Items] |  |
Remediation liability recorded as other current liabilities | 68 |
Remediation liability recorded as environmental costs in noncurrent liabilities | 289 |
Regulatory Assets | $ 357 |
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 |
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 |
Accrual for Environmental Loss Contingencies | $ 65 |
Passaic River Site Contingency [Member] | Public Service Electric and Gas Company |  |
Site Contingency [Line Items] |  |
Number of former generating electric station | Plant | 1 |
Accrual for Environmental Loss Contingencies | $ 52 |
Passaic River Site Contingency [Member] | PSEG Power LLC |  |
Site Contingency [Line Items] |  |
Accrual for Environmental Loss Contingencies | 13 |
Minimum | MGP Remediation Site Contingency [Member] | Public Service Electric and Gas Company |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | 357 |
Accrual for Environmental Loss Contingencies | 357 |
Maximum [Member] | MGP Remediation Site Contingency [Member] | Public Service Electric and Gas Company |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 400 |

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