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Financial Risk Management Activities (Schedule Of Derivative Transactions Designated And Effective As Cash Flow Hedges) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | $ 0 | $ (6) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | (1) | (2) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (2) | 2 |
Cash Flow Hedges [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (1) | (1) | $ (10)
PSEG Power [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (1) | 2 |
PSEG Power [Member] | Cash Flow Hedges [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 |
Interest Expense [Member] | Interest Rate Swap [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 0 | (6) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | $ (1) | $ (2) |

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