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Commitments And Contingent Liabilities (Environmental Matters) (Detail) $ in Millions | Dec. 31, 2020 USD ($) Plant mi | Dec. 31, 2019 USD ($)
--- | --- | ---
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 | 11 |
Accrued environmental costs | $ 286 | $ 349
Public Service Electric and Gas Company |  |
Site Contingency [Line Items] |  |
Accrued environmental costs | 236 | 294
Regulatory Assets | 4,241 | $ 4,028
MGP Remediation Site Contingency [Member] | Public Service Electric and Gas Company |  |
Site Contingency [Line Items] |  |
Remediation liability recorded as other current liabilities | 89 |
Remediation liability recorded as environmental costs in noncurrent liabilities | 231 |
Regulatory Assets | $ 320 |
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 | 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 | 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 | 320 |
Accrual for Environmental Loss Contingencies | 320 |
Maximum [Member] | MGP Remediation Site Contingency [Member] | Public Service Electric and Gas Company |  |
Site Contingency [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 358 |

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