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Trust Investments (Narrative) (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) Facility | Mar. 31, 2019 USD ($)
PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Number of Nuclear Facilities | Facility | 5 |  |
Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Unrealized Losses on Debt Securities | $ (3) | [1] | $ 0
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
After tax amount of net unrealized gains recognized in AOCI | 23 |  |
Debt Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
After tax amount of net unrealized gains recognized in AOCI | 10 |  |
Equity Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] | PSEG Power [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Unrealized Gains (Losses) on Equity Securities still held | (192) |  |
Equity Securities [Member] | Rabbi Trust [Member] |  |  |
Schedule of Trust Investments [Line Items] |  |  |
Unrealized Gains (Losses) on Equity Securities still held | $ (6) |  |
[1] | PSEG Power recognized an impairment of available-for-sale debt securities that it intends to sell. PSEG Power’s policy is to sell all such securities that are rated below investment grade.

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 + Details
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