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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - PSEG Power [Member] $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($) Counterparty
Derivative [Line Items] |  |
Current Exposure | $ 337 |
Securities held as Collateral | 70 |
Net exposure | 267 |
Number of Counterparties greater than 10% | $ 3 |
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty | 136 |
Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Percentage Of Credit Exposure | 99.00% |
Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | $ 335 |
Securities held as Collateral | 70 |
Net exposure | 265 |
Number of Counterparties greater than 10% | 3 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 136 | [1]
External Credit Rating, Non Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 2 |
Securities held as Collateral | 0 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
Non-Investment Grade [Member] |  |
Derivative [Line Items] |  |
Net exposure | 2 |
Number of Counterparties greater than 10% | 0 |
Cash [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | 3 |
Letter of Credit [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | 67 |
Other Entities [Member] | Investment Grade [Member] |  |
Derivative [Line Items] |  |
Amount Of Net Credit Exposure Greater Than Ten Percent | 86 |
Public Service Electric and Gas Company [Member] | Investment Grade [Member] |  |
Derivative [Line Items] |  |
Amount Of Net Credit Exposure Greater Than Ten Percent | $ 50 |
[1] | Represents net exposure of $50 million with PSE&G and $86 million with two non-affiliated counterpart

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