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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Settlements |  | $ (4) |  | $ (1) |  | $ (16) |  | $ 58 |
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 |  | 6 |  | 8 |  | (58) |
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized |  | 0 |  | 6 |  | (9) |  | 1 |
Net Derivative Assets (Liabilities) [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Opening Balance |  | 9 |  | 1 |  | 37 |  | 88 |
Included in Income |  | 5 | [1] | 6 | [1] | 8 | [1] | (58) | [2]
Included in Regulatory Assets/Liabilities | [3] | (2) |  | 10 |  | (21) |  | (72) |
Purchases, (Sales) |  | 0 |  | 0 |  | 0 |  | 0 |
Issuances (Settlements) | [4] | (4) |  | (1) |  | (16) |  | 58 |
Transfers In (Out) |  | 0 | [5] | (3) | [5] | 0 |  | (3) | [5]
Closing Balance |  | 8 |  | 13 |  | 8 |  | 13 |
Net Derivative Assets (Liabilities) [Member] | Power [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Opening Balance |  | 2 |  | (11) |  | 11 |  | (6) |
Included in Income |  | 5 | [1] | 6 | [1] | 8 | [1] | (58) | [2]
Included in Regulatory Assets/Liabilities | [3] | 0 |  | 0 |  | 0 |  | 0 |
Purchases, (Sales) |  | 0 |  | 0 |  | 0 |  | 0 |
Issuances (Settlements) | [4] | (4) |  | (1) |  | (16) |  | 58 |
Transfers In (Out) |  | 0 | [5] | (3) | [5] | 0 |  | (3) | [5]
Closing Balance |  | 3 |  | (9) |  | 3 |  | (9) |
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |
Opening Balance |  | 7 |  | 12 |  | 26 |  | 94 |
Included in Income |  | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [2]
Included in Regulatory Assets/Liabilities | [3] | (2) |  | 10 |  | (21) |  | (72) |
Purchases, (Sales) |  | 0 |  | 0 |  | 0 |  | 0 |
Issuances (Settlements) | [4] | 0 |  | 0 |  | 0 |  | 0 |
Transfers In (Out) |  | 0 | [5] | 0 | [5] | 0 |  | 0 | [5]
Closing Balance |  | $ 5 |  | $ 22 |  | $ 5 |  | $ 22 |
[1] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities includes $5 million and $8 million in Operating Income for the three months and six months ended June 30, 2015, respectively. The $5 million in Operating Income is realized. Of the $8 million in Operating Income, $(9) million is unrealized.
[2] | PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $6 million and $(58) million in Operating Income for the three months and six months ended June 30, 2014, respectively. The $6 million in Operating Income is unrealized. Of the $(58) million in Operating Income, $1 million is unrealized.
[3] | Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or 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 $(16) million in settlements for the three months and six months ended June 30, 2015. Includes $(1) million and $58 million in settlements for the three months and six months ended June 30, 2014.
[5] | During the three months and six months ended June 30, 2014, $(3) million of net derivative assets/liabilities were transferred from Level 3 to Level 2 due to more observable pricing for the underlying securities. The transfers were recognized as of the beginning of the quarters in which the transfers first occurred as per PSEG's policy.

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