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Fair Value Measurements (PSEG's, Power's And PSE&G's Respective Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value |  | $ 146 |  | $ 56 |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 44 |  | 1 |
Total Mark-to-Market Derivative Assets |  | 36 |  | 187 |
Total Mark-to-Market Derivative (Liabilities) |  | (21) |  | (16) |
Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets |  | 36 |  | 186 | [3]
Total Mark-to-Market Derivative (Liabilities) |  | (21) |  | (11) | [3]
Power [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 0 | [1],[2] | 0 |
Power [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
Power [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 0 | [1],[2] | 0 |
PSE&G [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
PSE&G [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
PSE&G [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
PSE&G [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [1],[2] | 0 |  | 0 |
PSE&G [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 0 | [1],[2] | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents | [4] | 223 |  | 365 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 1,053 |  | 954 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 92 |  | 44 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 25 |  | 22 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 2 |  | 1 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 1,053 |  | 954 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 92 | [1] | 44 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 6 |  | 5 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 0 | [1] | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents |  | 223 | [4] | 365 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | PSE&G [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 5 |  | 5 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | PSE&G [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | PSE&G [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | PSE&G [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Quoted Market Prices for Identical Assets (Level 1) [Member] | PSE&G [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 0 | [1] | 0 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents |  | 0 | [4] | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 2 |  | 3 |
Significant Other Observable Inputs (Level 2) [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 314 |  | 293 |
Significant Other Observable Inputs (Level 2) [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 270 |  | 227 |
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 402 |  | 337 |
Significant Other Observable Inputs (Level 2) [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 34 |  | 66 |
Significant Other Observable Inputs (Level 2) [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 51 |  | 37 |
Significant Other Observable Inputs (Level 2) [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 119 |  | 91 |
Significant Other Observable Inputs (Level 2) [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 2 |  | 3 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 270 |  | 293 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 314 |  | 227 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 402 |  | 337 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 0 | [1] | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 8 |  | 16 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 13 |  | 9 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 30 |  | 23 |
Significant Other Observable Inputs (Level 2) [Member] | Power [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 0 | [1] | 0 |
Significant Other Observable Inputs (Level 2) [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents |  | 0 | [4] | 0 |
Significant Other Observable Inputs (Level 2) [Member] | PSE&G [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) [Member] | PSE&G [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 7 |  | 13 |
Significant Other Observable Inputs (Level 2) [Member] | PSE&G [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 10 |  | 7 |
Significant Other Observable Inputs (Level 2) [Member] | PSE&G [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 24 |  | 18 |
Significant Other Observable Inputs (Level 2) [Member] | PSE&G [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 0 | [1] | 0 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents | [4] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 0 | [1] | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Power [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 0 | [1] | 0 |
Significant Unobservable Inputs (Level 3) [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents |  | 0 | [4] | 0 |
Significant Unobservable Inputs (Level 3) [Member] | PSE&G [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | PSE&G [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | PSE&G [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | PSE&G [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) [Member] | PSE&G [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments |  | 0 | [1] | 0 |
Interest Rate Swaps [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [2],[5] |  |  | 0 |
Interest Rate Swaps [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [5] |  |  | 0 |
Interest Rate Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [5] |  |  | 1 |
Interest Rate Swaps [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [5] |  |  | 0 |
Energy-Related Contracts [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [6] | 15 |  | 17 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (8) |  | 18 |
Energy-Related Contracts [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] | Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets |  | 15 | [6] | 17 |
Total Mark-to-Market Derivative (Liabilities) |  | (8) | [6] | 18 |
Energy-Related Contracts [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets |  |  |  | 0 |
Total Mark-to-Market Derivative (Liabilities) |  |  |  | 0 |
Energy-Related Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [6] | 442 |  | 533 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (485) |  | (364) |
Energy-Related Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] | Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets |  | 442 | [6] | 533 |
Total Mark-to-Market Derivative (Liabilities) |  | (485) | [6] | 364 |
Energy-Related Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets |  |  |  | 0 |
Total Mark-to-Market Derivative (Liabilities) |  |  |  | 0 |
Energy-Related Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [6] | 12 |  | 7 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (5) |  | (6) |
Energy-Related Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets |  | 12 | [6] | 7 |
Total Mark-to-Market Derivative (Liabilities) |  | (5) | [6] | 1 |
Energy-Related Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets |  |  |  | 0 |
Total Mark-to-Market Derivative (Liabilities) |  |  |  | 5 |
Cash and Cash Equivalents [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [2],[4] | 0 |  | 0 |
Cash and Cash Equivalents [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 0 | [2],[4] | 0 |
Assets [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (3) |  | (3) |
Assets [Member] | Energy-Related Contracts [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [2],[6] | (433) |  | (371) |
Assets [Member] | Energy-Related Contracts [Member] | Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | (433) | [6] | (371) |
Assets [Member] | Energy-Related Contracts [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  |  |  | 0 |
Other Liabilities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 47 |  | 4 |
Other Liabilities [Member] | Energy-Related Contracts [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net | [2],[6] | 477 |  | 372 |
Other Liabilities [Member] | Energy-Related Contracts [Member] | Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | 477 | [2],[6] | 372 |
Other Liabilities [Member] | Energy-Related Contracts [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  |  |  | 0 |
Total Estimate Of Fair Value [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents | [4] | 223 |  | 365 |
Total Estimate Of Fair Value [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 1,055 |  | 957 |
Total Estimate Of Fair Value [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 270 |  | 293 |
Total Estimate Of Fair Value [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 314 |  | 227 |
Total Estimate Of Fair Value [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 402 |  | 337 |
Total Estimate Of Fair Value [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 92 |  | 44 |
Total Estimate Of Fair Value [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 25 |  | 22 |
Total Estimate Of Fair Value [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 34 |  | 66 |
Total Estimate Of Fair Value [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 51 |  | 37 |
Total Estimate Of Fair Value [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 119 |  | 91 |
Total Estimate Of Fair Value [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 2 |  | 1 |
Total Estimate Of Fair Value [Member] | Power [Member] | Equity Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 1,055 |  | 957 |
Total Estimate Of Fair Value [Member] | Power [Member] | Government Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 270 |  | 293 |
Total Estimate Of Fair Value [Member] | Power [Member] | US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 314 |  | 227 |
Total Estimate Of Fair Value [Member] | Power [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 402 |  | 337 |
Total Estimate Of Fair Value [Member] | Power [Member] | Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 92 |  | 44 |
Total Estimate Of Fair Value [Member] | Power [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 6 |  | 5 |
Total Estimate Of Fair Value [Member] | Power [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 8 |  | 16 |
Total Estimate Of Fair Value [Member] | Power [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 13 |  | 9 |
Total Estimate Of Fair Value [Member] | Power [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 30 |  | 23 |
Total Estimate Of Fair Value [Member] | Power [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Total Estimate Of Fair Value [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents | [4] | 223 |  | 365 |
Total Estimate Of Fair Value [Member] | PSE&G [Member] | Rabbi Trust - Equity Securities-Mutual Funds [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 5 |  | 5 |
Total Estimate Of Fair Value [Member] | PSE&G [Member] | Rabbi Trust - Debt Securities-Govt Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 7 |  | 13 |
Total Estimate Of Fair Value [Member] | PSE&G [Member] | Rabbi Trusts US Treasury Obligations [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 10 |  | 7 |
Total Estimate Of Fair Value [Member] | PSE&G [Member] | Rabbi Trust - Debt Securities-Corporate [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 24 |  | 18 |
Total Estimate Of Fair Value [Member] | PSE&G [Member] | Rabbi Trust - Other Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [1] | 0 |  | 0 |
Total Estimate Of Fair Value [Member] | Interest Rate Swaps [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [5] |  |  | 1 |
Total Estimate Of Fair Value [Member] | Energy-Related Contracts [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [6] | 36 |  | 186 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (21) |  | (16) |
Total Estimate Of Fair Value [Member] | Energy-Related Contracts [Member] | Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [6] | 36 |  | 186 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (21) |  | (11) |
Total Estimate Of Fair Value [Member] | Energy-Related Contracts [Member] | PSE&G [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets | [6] |  |  | 0 |
Total Mark-to-Market Derivative (Liabilities) | [6] |  |  | (5) |
Operating Revenues [Member] | Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Trading Revenue |  | 14 |  | 25 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (9) |  | (5) |
Energy Costs [Member] | Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Trading Revenue |  | $ 12 |  | $ (12) |
[1] | As of December 31, 2016, the fair value measurement table excludes cash of $1 million, which is part of the NDT Fund. The NDT Fund maintains investments in various equity and fixed income securities classified as “available for sale.” The Rabbi Trust maintains investments in a Russell 3000 index fund and various fixed income securities classified as “available for sale” as of December 31, 2017. The Rabbi Trust maintained investments in an S&P 500 index fund and various securities classified as “available for sale” as of December 31, 2016. These securities are generally valued with prices that are either exchange provided (equity securities) or market transactions for comparable securities and/or broker quotes (fixed income securities).Level 1—Investments in marketable equity securities within the NDT Fund are primarily investments in common stocks across a broad range of industries and sectors. Most equity securities are priced utilizing the principal market close price or, in some cases, midpoint, bid or ask price. Other Securities in the NDT and Rabbi Trust Funds consist primarily of investments in Dreyfus money market funds which seek a high level of current income as is consistent with the preservation of capital and the maintenance of liquidity. To pursue its goals, the fund normally invests in a diversified portfolio of high quality, short-term, dollar-denominated debt securities and government securities. The funds’ Net Asset Value is priced and published daily. The Rabbi Trust equity index fund is valued based on quoted prices in an active market.Level 2—NDT and Rabbi Trust fixed income securities include investment grade corporate bonds, collateralized mortgage obligations, asset-backed securities and certain government and U.S. Treasury obligations or Federal Agency asset-backed securities and municipal bonds with a wide range of maturities. Since many fixed income securities do not trade on a daily basis, they are priced using an evaluated pricing methodology that varies by asset class and reflects observable market information such as the most recent exchange price or quoted bid for similar securities. Market-based standard inputs typically include benchmark yields, reported trades, broker/dealer quotes and issuer spreads. The preferred stocks are not actively traded on a daily basis and therefore, are also priced using an evaluated pricing methodology. Certain short-term investments are valued using observable market prices or market parameters such as time-to-maturity, coupon rate, quality rating and current yield.
[2] | Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. All cash collateral received or posted that has been allocated to derivative positions, where the right of offset exists, has been offset in the Consolidated Balance Sheets. As of December 31, 2017 and 2016, Power had net cash collateral/margin payments to counterparties of $146 million and $56 million, respectively. Of these net cash collateral/margin payments $44 million as of December 31, 2017 and $1 million as of December 31, 2016 were netted against the corresponding net derivative contract positions. Of the $44 million of cash collateral as of December 31, 2017, $(3) million was netted against assets, and $47 million was netted against liabilities. Of the $1 million of cash collateral as of December 31, 2016, $(3) million was netted against assets and $4 million was netted against liabilities.
[3] | Substantially all of Power's and PSEG's derivative instruments are contracts subject to master netting agreements. Contracts not subject to master netting or similar agreements are immaterial and did not have any collateral posted or received as of December 31, 2017 and 2016. PSE&G does not have any derivative contracts subject to master netting or similar agreements.
[4] | Represents money market mutual funds.
[5] | Interest rate swaps are valued using quoted prices on commonly quoted intervals, which are interpolated for periods different than the quoted intervals, as inputs to a market valuation model. Market inputs can generally be verified and model selection does not involve significant management judgment.
[6] | Level 1—During 2016 a net fair value of $1 million relating to energy-related contracts was transferred from Level 2 into Level 1. These contracts represent natural gas futures contracts executed on NYMEX, and are being valued solely on settled pricing inputs which come directly from the exchange. Level 2—Fair values for energy-related contracts are obtained primarily using a market-based approach. Most derivative contracts (forward purchase or sale contracts and swaps) are valued using settled prices from similar assets and liabilities from an exchange, such as NYMEX, ICE and Nodal Exchange, or auction prices. Prices used in the valuation process are also corroborated independently by management to determine that values are based on actual transaction data or, in the absence of transactions, bid and offers for the day. Examples may include certain exchange and non-exchange traded capacity and electricity contracts and natural gas physical or swap contracts based on market prices, basis adjustments and other premiums where adjustments and premiums are not considered significant to the overall inputs.Level 3—Unobservable inputs are used for the valuation of certain contracts. See “Additional Information Regarding Level 3 Measurements” below for more information on the utilization of unobservable inputs.

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