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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 | Dec. 31, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Amount Offset Against Collateral, Net |  | $ 1 |  | $ (55) |
Total Mark-to-Market Derivative Assets |  | 187 |  | 319 |
Total Mark-to-Market Derivative (Liabilities) |  | (16) |  | (103) |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
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 |  |  |
Power [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total Mark-to-Market Derivative Assets |  | 186 |  | 300 | [3]
Total Mark-to-Market Derivative (Liabilities) |  | (11) |  | (92) | [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 | [1],[2] | 0 |  | 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 | [1],[2] | 0 |  | 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 | [1],[2] | 0 |  | 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] | 365 |  | 326 |
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 | [2] | 954 |  | 865 |
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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 44 |  | 42 |
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 | [2] | 22 |  | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 1 |  | 2 |
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 | [2] | 954 |  | 865 |
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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 44 |  | 42 |
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 | [2] | 5 |  | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 0 |  | 1 |
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 | [4] | 365 |  | 160 |
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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 0 |  | 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 | [2] | 3 |  | 0 |
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 | [2] | 293 |  | 311 |
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 | [2] | 227 |  | 177 |
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 | [2] | 337 |  | 359 |
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 | [2] | 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 | [2] | 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 | [2] | 66 |  | 60 |
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 | [2] | 37 |  | 48 |
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 | [2] | 91 |  | 81 |
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 | [2] | 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 | [2] | 3 |  | 0 |
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 | [2] | 293 |  | 311 |
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 | [2] | 227 |  | 177 |
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 | [2] | 337 |  | 359 |
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 | [2] | 0 |  | 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 | [2] | 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 | [2] | 16 |  | 14 |
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 | [2] | 9 |  | 12 |
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 | [2] | 23 |  | 20 |
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 | [2] | 0 |  | 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 | [4] | 0 |  | 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 | [2] | 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 | [2] | 13 |  | 12 |
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 | [2] | 7 |  | 9 |
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 | [2] | 18 |  | 16 |
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 | [2] | 0 |  | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 0 |  | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 0 |  | 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 | [4] | 0 |  | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 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 | [2] | 0 |  | 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 |  | 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 |  | 6 |
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 |  | 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] | 17 |  | 0 |
Total Mark-to-Market Derivative (Liabilities) | [6] | 18 |  | 0 |
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 | [6] | 17 |  | 0 |
Total Mark-to-Market Derivative (Liabilities) | [6] | 18 |  | 0 |
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 | [6] | 0 |  | 0 |
Total Mark-to-Market Derivative (Liabilities) | [6] | 0 |  | 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] | 533 |  | 896 |
Total Mark-to-Market Derivative (Liabilities) | [6] | 364 |  | (644) |
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 | [6] | 533 |  | 896 |
Total Mark-to-Market Derivative (Liabilities) | [6] | 364 |  | 644 |
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 | [6] | 0 |  | 0 |
Total Mark-to-Market Derivative (Liabilities) | [6] | 0 |  | 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] | 7 |  | 25 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (6) |  | (12) |
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 | [6] | 7 |  | 12 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (1) |  | (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 | [6] | 0 |  | 13 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (5) |  | (11) |
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 | [1],[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 | [1],[4] | 0 |  | 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) |  | (69) |
Assets [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 |
Assets [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 |
Assets [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 |
Assets [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 |
Assets [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 | [1],[2] |  |  | 0 |
Assets [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 |
Assets [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 |
Assets [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 |
Assets [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 |
Assets [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 | [1],[2] |  |  | 0 |
Assets [Member] | 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 | [1],[5] | 0 |  | 0 |
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 | [1],[6] | (371) |  | (608) |
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 | [6] | (371) |  | (608) | [1]
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 | [1],[6] | 0 |  | 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 |  | 4 |  | 14 |
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 | [1],[6] | 372 |  | 553 |
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 | [1],[6] | 372 |  | 553 |
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 | [1],[6] | 0 |  | 0 |
Total Estimate Of Fair Value [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash Equivalents | [4] | 365 |  | 326 |
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 | [2] | 957 |  | 865 |
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 | [2] | 293 |  | 311 |
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 | [2] | 227 |  | 177 |
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 | [2] | 337 |  | 359 |
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 | [2] | 44 |  | 42 |
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 | [2] | 22 |  | 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 | [2] | 66 |  | 60 |
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 | [2] | 37 |  | 48 |
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 | [2] | 91 |  | 81 |
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 | [2] | 1 |  | 2 |
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 | [2] | 957 |  | 865 |
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 | [2] | 293 |  | 311 |
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 | [2] | 227 |  | 177 |
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 | [2] | 337 |  | 359 |
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 | [2] | 44 |  | 42 |
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 | [2] | 5 |  | 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 | [2] | 16 |  | 14 |
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 | [2] | 9 |  | 12 |
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 | [2] | 23 |  | 20 |
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 | [2] | 0 |  | 1 |
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] | 365 |  | 160 |
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 | [2] | 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 | [2] | 13 |  | 12 |
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 | [2] | 7 |  | 9 |
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 | [2] | 18 |  | 16 |
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 | [2] | 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 |  | 6 |
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] | 186 |  | 313 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (16) |  | (103) |
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] | 186 |  | 300 |
Total Mark-to-Market Derivative (Liabilities) | [6] | (11) |  | (92) |
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 |  | 13 |
Total Mark-to-Market Derivative (Liabilities) | [6] | $ (5) |  | $ (11) |
[1] | 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 Condensed Consolidated Balance Sheets. As of December 31, 2016, net cash collateral (received) paid of $1 million was netted against the corresponding net derivative contract positions. 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. As of December 31, 2015, net cash collateral (received) paid of $(55) million was netted against the corresponding net derivative contract positions. Of the $(55) million of cash collateral as of December 31, 2015, $(69) million was netted against assets and $14 million was netted against liabilities.
[2] | 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 an S&P 500 index fund and various fixed income securities classified as “available for sale.” 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. Certain open-ended mutual funds with mainly short-term investments are valued based on unadjusted quoted prices in active markets. 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 US 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.
[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, 2016 and 2015. 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 an exchange, such as NYMEX, Intercontinental Exchange 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—For energy-related contracts, which include more complex agreements where limited observable inputs or pricing information are available, modeling techniques are employed using assumptions reflective of contractual terms, current market rates, forward price curves, discount rates and risk factors, as applicable. Fair values of other energy contracts may be based on broker quotes that we cannot corroborate with actual market transaction data.

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