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Trust Investments (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | $ 39 |  | $ 8 |  | $ 167 |  | $ (14) |
Rabbi Trust [Member] |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sales |  | 42 | [1] | 22 | [1] | 86 | [2] | 47 | [2]
Gross Realized Gains |  | 1 |  | 0 |  | 2 |  | 2 |
Gross Realized Losses |  | 0 |  | 0 |  | (1) |  | (2) |
Net Realized Gains (Losses) | [3] | 1 |  | 0 |  | 1 |  | 0 |
Unrealized Gain (Loss) on Securities |  | 0 |  | 0 |  | 3 |  | 0 |
Net Gains (Losses) on Trust Investments |  | 1 |  | 0 |  | 4 |  | 0 |
PSEG Power [Member] |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |
Net Gains (Losses) on Trust Investments |  | 38 |  | 8 |  | 164 |  | (14) |
PSEG Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |  |  |  |  |  |
Schedule of Trust Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sales | [1] | 427 |  | 402 |  | 880 |  | 774 |
Gross Realized Gains |  | 18 |  | 34 |  | 63 |  | 58 |
Gross Realized Losses |  | (13) |  | (10) |  | (32) |  | (22) |
Net Realized Gains (Losses) | [4] | 5 |  | 24 |  | 31 |  | 36 |
Unrealized Gain (Loss) on Securities |  | 33 |  | (16) |  | 132 |  | (50) |
Net Gains (Losses) on Trust Investments |  | $ 38 |  | $ 8 |  | $ 163 |  | $ (14) |
[1] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[2] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers.
[3] | The cost of these securities was determined on the basis of specific identification.
[4] | The cost of these securities was determined on the basis of specific identification.

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