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Financial Risk Management Activities (Schedule Providing Credit Risk From Others, Net Of Collateral) (Detail) - PSEG Power [Member] $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) Counterparty
Derivative [Line Items] |  |
Current Exposure | $ 492 |
Securities held as Collateral | 93 |
Net exposure | 399 |
Number of Counterparties greater than 10% | $ 3 |
Number Of Active Counterparties On Credit Risk Derivatives | Counterparty | 141 |
Investment Grade - External Rating [Member] |  |
Derivative [Line Items] |  |
Percentage Of Credit Exposure | 99.00% |
Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | $ 488 |
Securities held as Collateral | 93 |
Net exposure | 395 |
Number of Counterparties greater than 10% | 3 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 235 | [1]
External Credit Rating, Non Investment Grade [Member] |  |
Derivative [Line Items] |  |
Current Exposure | 4 |
Securities held as Collateral | 0 |
Amount Of Net Credit Exposure Greater Than Ten Percent | 0 |
Non-Investment Grade [Member] |  |
Derivative [Line Items] |  |
Net exposure | 4 |
Number of Counterparties greater than 10% | 0 |
Cash [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | 6 |
Letter of Credit [Member] |  |
Derivative [Line Items] |  |
Securities held as Collateral | 87 |
Other Entities [Member] | Investment Grade [Member] |  |
Derivative [Line Items] |  |
Amount Of Net Credit Exposure Greater Than Ten Percent | 98 |
Public Service Electric and Gas Company [Member] | Investment Grade [Member] |  |
Derivative [Line Items] |  |
Amount Of Net Credit Exposure Greater Than Ten Percent | $ 137 |
[1] | Represents net exposure of $137 million with PSE&G and $98 million with two non-affiliated counterpart

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