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Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) - Debt Securities [Member] - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Available-for-sale debt securities, Less than one year | $ 3 |
Available-for-sale debt securities, 1-5 years | 28 |
Available-for-sale debt securities, 6-10 years | 33 |
Available-for-sale debt securities, 11-15 years | 14 |
Available-for-sale debt securities, 16-20 years | 28 |
Available-for-sale debt securities, Over 20 years | 112 |
Total Available-for-Sale Debt Securities | 218 | $ 201
PSEG Power LLC | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Available-for-sale debt securities, Less than one year | 19 |
Available-for-sale debt securities, 1-5 years | 273 |
Available-for-sale debt securities, 6-10 years | 188 |
Available-for-sale debt securities, 11-15 years | 51 |
Available-for-sale debt securities, 16-20 years | 77 |
Available-for-sale debt securities, Over 20 years | 455 |
Total Available-for-Sale Debt Securities | $ 1,063 | $ 978

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