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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | $ 0 | $ 0 | $ (6) | $ (24) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | (5) | (1) | (11) | (2) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | (1) | 6 | (6) |
Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (4) | (1) | (8) | (1) | $ (3)
PSEG Power [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 3 | 1 | 11 | (4) |
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 | 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 | 0 | (6) | (24) |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | $ (5) | $ (1) | $ (11) | $ (2) |

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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17B -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581 + Details
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- Definition Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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