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Trust Investments (Fair Values And Gross Unrealized Gains And Losses For The Securities Held) (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Trust Investments [Line Items]      
Net Gains (Losses) on Trust Investments $ (221) $ 128  
PSEG Power [Member]      
Schedule of Trust Investments [Line Items]      
Net Gains (Losses) on Trust Investments (220) 126  
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]      
Schedule of Trust Investments [Line Items]      
Proceeds from Sales [1] 555 453  
Trust Investments, Cost 1,882   $ 1,858
Gross Unrealized Gains 232   374
Gross Unrealized Losses (87)   (18)
Trust Investments, Fair Value 2,027 [2]   2,214
Gross Realized Gains 38 45  
Available-for-sale Securities, Gross Realized Losses 34 19  
Realized Investment Gains (Losses) [3] 4 26  
Unrealized Gain (Loss) on Equity Securities (221) 99  
Net Gains (Losses) on Trust Investments (220) 125  
NDT Fund Foreign Currency     2
Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Proceeds from Sales [4] 54 44  
Trust Investments, Cost 229   228
Gross Unrealized Gains 18   18
Gross Unrealized Losses (3)   0
Trust Investments, Fair Value 244   246
Gross Realized Gains 5 1  
Available-for-sale Securities, Gross Realized Losses 1 1  
Realized Investment Gains (Losses) [5] 4 0  
Unrealized Gain (Loss) on Equity Securities (5) 3  
Net Gains (Losses) on Trust Investments (1) $ 3  
Total Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 1,051   1,033
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 52   33
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 12   3
Debt Securities, Available-for-Sale, Fair Value 1,091   1,063
Total Debt Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 208   207
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 17   11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3   0
Debt Securities, Available-for-Sale, Fair Value 222   218
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 831   825
Equity Securities, Accumulated Gross Unrealized Gain 180   341
Equity Securities, Accumulated Gross Unrealized Loss 75   15
Equity Securities, Fair Value 936   1,151
Corporate Debt Obligations [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 525   470
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 13   17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 11   1
Debt Securities, Available-for-Sale, Fair Value 527   486
Corporate Debt Obligations [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 111   107
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4   7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3   0
Debt Securities, Available-for-Sale, Fair Value 112   114
Government Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 526   563
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 39   16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1   2
Debt Securities, Available-for-Sale, Fair Value 564   577
Government Debt Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Debt Securities, Available-for-sale, Amortized Cost 97   100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 13   4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0   0
Debt Securities, Available-for-Sale, Fair Value 110   104
International Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 386   400
Equity Securities, Accumulated Gross Unrealized Gain 33   103
Equity Securities, Accumulated Gross Unrealized Loss 48   11
Equity Securities, Fair Value 371   492
Domestic Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 445   425
Equity Securities, Accumulated Gross Unrealized Gain 147   238
Equity Securities, Accumulated Gross Unrealized Loss 27   4
Equity Securities, Fair Value 565   659
Domestic Equity Securities [Member] | Rabbi Trust [Member]      
Schedule of Trust Investments [Line Items]      
Equity Securities, Cost 21   21
Equity Securities, Accumulated Gross Unrealized Gain 1   7
Equity Securities, Accumulated Gross Unrealized Loss 0   0
Equity Securities, Fair Value $ 22   $ 28
[1] Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[2]
The NDT Fund Investments table excludes foreign currency of $2 million as of December 31, 2019, which is part of the NDT Fund.
[3] The cost of these securities was determined on the basis of specific identification.
[4] Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[5] The cost of these securities was determined on the basis of specific identification.