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Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivatives, Fair Value [Line Items] |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ 1 |  |
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net | 1 |  |
Long-term Debt | 11,483 |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | 2 |  |
Net cash collateral received in connection with net derivative contracts | 1 | $ (55) |
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 19 | 78 |
PSEG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Long-term Debt | 1,200 | 500 |
Fair value of interest rate swaps designated as underlying hedges |  | 6 |
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 9 | 12 |
Additional collateral aggregate fair value | 10 | 66 |
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges | 6 | 19 | $ 20
PSEG [Member] | Variable Rate Term Loan due 2017 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Long-term Debt | $ 500 | 500 |
PSEG [Member] | Senior Notes One Point Six Zero Percent Due In Two Thousand Nineteen [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Stated interest rate of debt instrument | 1.60% |  |
Long-term Debt | $ 400 | 0 |
Debt Instrument, Face Amount | $ 400 |  |
PSEG [Member] | Senior Notes Two Point Zero Percent Due In Two Thousand Twenty One [Member] [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Stated interest rate of debt instrument | 2.00% |  |
Long-term Debt | $ 300 | 0 |
Debt Instrument, Face Amount | 300 |  |
Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Credit Exposure With Counterparties After Applying Collateral | 354 |  |
Long-term Debt | $ 2,400 | 2,253 |
Power [Member] | Senior Notes Three Point Zero Percent Due In Two Thousand Twenty One [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Stated interest rate of debt instrument | 3.00% |  |
Long-term Debt | $ 700 | 0 |
Debt Instrument, Face Amount | 700 |  |
Non Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | (3) | (16) |
Current Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts | 4 | 12 |
Noncurrent Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts |  | 2 |
Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net cash collateral received in connection with net derivative contracts |  | $ (53) |
Fair Value Hedging [Member] | PSEG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate amount of series of interest rate swaps converting to variable-rate debt | 550 |  |
Cash Flow Hedging [Member] | PSEG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate amount of series of interest rate swaps converting to variable-rate debt | 500 |  |
Cash Flow Hedging [Member] | PSEG [Member] | Senior Notes One Point Six Zero Percent Due In Two Thousand Nineteen [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate amount of series of interest rate swaps converting to variable-rate debt | 400 |  |
Cash Flow Hedging [Member] | PSEG [Member] | Senior Notes Two Point Zero Percent Due In Two Thousand Twenty One [Member] [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Aggregate amount of series of interest rate swaps converting to variable-rate debt | $ 300 |  |

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