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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
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Settlements |  | $ (15) | $ (12)
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 |  | 15 | 3
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized |  |  | (9)
Net Derivative Assets (Liabilities) [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Opening Balance |  | 13 | 37
Included in Income | [1] | 15 | 3
Included in Regulatory Assets/Liabilities | [2] | 8 | (19)
Purchases, (Sales) |  | 0 | 0
Issuances (Settlements) | [3] | (15) | (12)
Transfers In (Out) | [4] | 0 | 0
Closing Balance |  | 21 | 9
Net Derivative Assets (Liabilities) [Member] | Power [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Opening Balance |  | 11 | 11
Included in Income | [1] | 15 | 3
Included in Regulatory Assets/Liabilities | [2] | 0 | 0
Purchases, (Sales) |  | 0 | 0
Issuances (Settlements) | [3] | (15) | (12)
Transfers In (Out) | [4] | 0 | 0
Closing Balance |  | 11 | 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 |  | 2 | 26
Included in Income | [1] | 0 | 0
Included in Regulatory Assets/Liabilities | [2] | 8 | (19)
Purchases, (Sales) |  | 0 | 0
Issuances (Settlements) | [3] | 0 | 0
Transfers In (Out) | [4] | 0 | 0
Closing Balance |  | $ 10 | $ 7
[1] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $15 million and $3 million in Operating Income in 2016 and 2015, respectively. The $15 million in Operating Income in 2016 is realized. Of the $3 million in Operating Income, $(9) million is unrealized.
[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 $(15) million and $(12) million in settlements for the three months ended March 31, 2016 and 2015.
[4] | There were no transfers among levels during the three months ended March 31, 2016 and 2015.

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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=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: 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=36462937&loc=d3e19279-110258 + Details
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