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Financial Risk Management Activities (Narrative) (Detail) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) Counterparty | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | $ 8 |  | $ 24
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 82 |  | 127
Additional collateral aggregate fair value | 907 |  | 945
Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net exposure | 314 |  |
Amount of after-tax gains on derivatives designated and effective as cash flow hedges expected to be reclassified to earnings during the 12 months following period end | $ 1 |  |
Credit exposure, percentage | 99.30% |  |
Number of active counterparties on credit risk derivatives | Counterparty | 138 |  |
Power [Member] | Senior Notes 5.32% Due September 2016 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Senior Notes converted into variable rate debt | $ 303 |  |
PSEG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate amount of series of interest rate swaps converting to variable-rate debt | 850 |  |
Fair value of interest rate swaps designated as underlying hedges | 15 |  | 22
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 18 |  |
Additional collateral aggregate fair value | 64 |  | 109
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges | (5) | $ (10) |
PSEG [Member] | Senior Notes 5.5% Due December 2015 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Senior Notes converted into variable rate debt | $ 300 |  |
Stated interest rate of debt instrument | 5.50% |  |
PSEG [Member] | Senior Notes 5.32% Due September 2016 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Senior Notes converted into variable rate debt | $ 300 |  |
Stated interest rate of debt instrument | 5.32% |  |
PSEG [Member] | Senior Notes 2.75% Due September 2016 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Senior Notes converted into variable rate debt | $ 250 |  |
Stated interest rate of debt instrument | 2.75% |  |
Non Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | $ (4) |  | $ (8)
Investment Grade - External Rating [Member] | Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net exposure | 302 |  |
Investment Grade - External Rating [Member] | PSE And G [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net exposure | 82 |  |
Investment Grade - External Rating [Member] | Nonaffiliated [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net exposure | $ 37 |  |

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