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Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivatives, Fair Value [Line Items] |  |  |
Other Comprehensive Income before Reclassifications | $ (9) | $ 77 | $ (3)
Floating Rate term loans | 14,558 |  |
Net cash collateral received in connection with net derivative contracts | 153 | 44 |
Accumulated Other Comprehensive Income (Loss) on interest rate derivatives | (1) |  | 2
PSEG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Floating Rate term loans | 2,450 | 2,100 |
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges |  |  | 6
Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Credit Exposure With Counterparties After Applying Collateral | 253 |  |
Other Comprehensive Income before Reclassifications | (3) | 78 | $ (3)
Floating Rate term loans | 2,850 | 2,400 |
Credit Risk Derivative Liabilities, at Fair Value | 22 | 30 |
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 7 | 13 |
Additional collateral aggregate fair value | $ 15 | 17 |
Power [Member] | Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Stated interest rate of debt instrument | 3.85% |  |
Floating Rate term loans | $ 700 | $ 0 |
Debt Instrument, Face Amount | 700 |  |
Cash Flow Hedging [Member] | PSEG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate amount of series of interest rate swaps converting to variable-rate debt | $ 500 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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