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Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | $ (55) | $ 24 |
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 78 | 127 |
Additional collateral aggregate fair value | 864 | 945 |
PSEG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate amount of series of interest rate swaps converting to variable-rate debt | 550 |  |
Fair value of interest rate swaps designated as underlying hedges | 6 | 22 |
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 12 | 18 |
Additional collateral aggregate fair value | 66 | 109 |
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges | 19 | 20 | $ 19
PSEG [Member] | Senior Notes 5.5% Due December 2015 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Senior Notes converted into variable rate debt | $ 300 |  |
PSEG [Member] | Senior Notes 5.32% Due September 2016 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
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% |  |
Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Credit Exposure With Counterparties After Applying Collateral | $ 312 |  |
Power [Member] | Senior Notes 5.32% Due September 2016 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Senior Notes converted into variable rate debt | 303 |  |
Non Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | (16) | (8) |
Current Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | 12 | 32 |
Noncurrent Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | 2 | 4 |
Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | $ (53) | $ (4) |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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