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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Settlements |  | $ (4) |  | $ (2) |  | $ (24) |  | $ (18) |
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 |  | 8 |  | 4 |  | 24 |  | 12 |
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized |  | 4 |  |  |  |  |  | (6) |
Net Derivative Assets (Liabilities) [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Opening Balance |  | 5 |  | 8 |  | 13 |  | 37 |
Included in Income |  | 8 | [1] | 4 | [2] | 24 | [1] | 12 | [2]
Included in Regulatory Assets/Liabilities | [3] | (2) |  | (8) |  | (6) |  | (29) |
Purchases, (Sales) |  | 4 |  | 0 |  | 4 |  | 0 |
Issuances (Settlements) | [4] | (4) |  | (2) |  | (24) |  | (18) |
Transfers In (Out) | [5] | 0 |  | 0 |  | 0 |  | 0 |
Closing Balance |  | 11 |  | 2 |  | 11 |  | 2 |
Net Derivative Assets (Liabilities) [Member] | Power [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Opening Balance |  | 7 |  | 3 |  | 11 |  | 11 |
Included in Income |  | 8 | [1] | 4 | [2] | 24 | [1] | 12 | [2]
Included in Regulatory Assets/Liabilities | [3] | 0 |  | 0 |  | 0 |  | 0 |
Purchases, (Sales) |  | 4 |  | 0 |  | 4 |  | 0 |
Issuances (Settlements) | [4] | (4) |  | (2) |  | (24) |  | (18) |
Transfers In (Out) | [5] | 0 |  | 0 |  | 0 |  | 0 |
Closing Balance |  | 15 |  | 5 |  | 15 |  | 5 |
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) |  | 5 |  | 2 |  | 26 |
Included in Income |  | 0 | [1] | 0 | [2] | 0 | [1] | 0 | [2]
Included in Regulatory Assets/Liabilities | [3] | (2) |  | (8) |  | (6) |  | (29) |
Purchases, (Sales) |  | 0 |  | 0 |  | 0 |  | 0 |
Issuances (Settlements) | [4] | 0 |  | 0 |  | 0 |  | 0 |
Transfers In (Out) | [5] | 0 |  | 0 |  | 0 |  | 0 |
Closing Balance |  | $ (4) |  | $ (3) |  | $ (4) |  | $ (3) |
[1] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $8 million and $24 million in Operating Income for the three months and nine months ended September 30, 2016, respectively. Of the $8 million in Operating Income, $4 million is unrealized. The $24 million in Operating Income is realized.
[2] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $4 million and $12 million in Operating Income for the three months and nine months ended September 30, 2015, respectively. Of the $4 million in Operating Income, $3 million is unrealized. Of the $12 million in Operating Income, $(6) million is unrealized.
[3] | 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.
[4] | Represents $(4) million and $(24) million in settlements for the three months and nine months ended September 30, 2016, respectively. Represents $(2) million and $(18) million in settlements for the three months and nine months ended September 30, 2015, respectively.
[5] | There were no transfers among levels during the three months and nine months ended September 30, 2016 and 2015.

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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=36462937&loc=d3e19279-110258 + Details
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