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Financial Risk Management Activities (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net | $ 1 |  |
Floating Rate term loans |  |  | $ 13,158
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 |  | 44
PSEG [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Floating Rate term loans | 1,200 |  | 2,100
Amount of reduction in interest expense attributed to interest rate swaps designated as fair value hedges | 6 | $ 19 |
PSEG [Member] | Term Loan maturing in 2017 [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Floating Rate term loans | 500 |  | $ 0
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%
Floating Rate term loans | 400 |  | $ 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%
Floating Rate term loans | 300 |  | $ 300
Power [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Credit Exposure With Counterparties After Applying Collateral |  |  | 306
Floating Rate term loans | 2,400 |  | 2,400
Credit Risk Derivative Liabilities, at Fair Value | 19 |  | 30
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral | 9 |  | 13
Additional collateral aggregate fair value | 10 |  | $ 17
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%
Floating Rate term loans | $ 700 |  | $ 700
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

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