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Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Settlements |  | $ 1 | $ (22)
Net Derivative Assets (Liabilities) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Opening Balance |  | 7 | 1
Included in Income | [1] | 1 | (19)
Included in Regulatory Assets/Liabilities | [2] | 0 | 6
Purchases, (Sales) |  | 0 | 0
Issuances (Settlements) | [3] | 1 | (22)
Transfers In (Out) | [4] | 0 | (1)
Closing Balance |  | 7 | 3
Net Derivative Assets (Liabilities) [Member] | Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Opening Balance |  | 7 | 6
Included in Income | [1] | 1 | (19)
Included in Regulatory Assets/Liabilities | [2] | 0 | 0
Purchases, (Sales) |  | 0 | 0
Issuances (Settlements) | [3] | 1 | (22)
Transfers In (Out) | [4] | 0 | (1)
Closing Balance |  | 7 | 2
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Opening Balance |  |  | (5)
Included in Income | [1] |  | 0
Included in Regulatory Assets/Liabilities | [2] |  | 6
Purchases, (Sales) |  |  | 0
Issuances (Settlements) | [3] |  | 0
Transfers In (Out) | [4] |  | 0
Closing Balance |  |  | 1
Operating Revenues [Member] | Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income |  |  | 14
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized |  | 8 | (4)
Energy Costs [Member] | Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income |  |  | 5
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized |  | $ (9) | $ 1
[1] | PSEG’s and Power’s gains(losses) attributable to changes in net derivative assets and liabilities for the three months ended March 31, 2018 include $8 million in Operating Revenues, all of which is unrealized and $(9) million in Energy Costs, all of which is unrealized. For the three months ended March 31, 2017, $14 million is included in Operating Revenues, of which $(4) million is unrealized, and $5 million is in Energy Costs, of which $1 million is unrealized. Unrealized gains (losses) represent the change in derivative assets and liabilities still held at the end of the reporting period.
[2] | Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Accumulated Other Comprehensive Income, as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G’s customers.
[3] | Represents $1 million and $(22) million in settlements for the three months ended March 31, 2018 and 2017, respectively.
[4] | During the three months ended March 31, 2017, $(1) million of net derivatives were transferred from Level 2 to Level 3.

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into (out of) level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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