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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 | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral Already Posted, Aggregate Fair Value |  | $ 203 |  | $ 393
Total Mark-to-Market Derivative Assets |  | 24 |  | 12
Total Mark-to-Market Derivative (Liabilities) |  | (20) |  | (15)
Collateral netted against assets and liabilities |  | 48 |  | 153
Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Mark-to-Market Derivative Assets |  | 23 |  | 12
Total Mark-to-Market Derivative (Liabilities) |  | (14) |  | (15)
Collateral netted against assets and liabilities |  | 48 | [1],[2] | 153
Quoted Market Prices of Identical Assets (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash Equivalents, Fair Value Disclosure | [3] |  |  | 100
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash Equivalents, Fair Value Disclosure | [3] |  |  | 0
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash Equivalents, Fair Value Disclosure | [3] |  |  | 0
Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash Equivalents, Fair Value Disclosure | [3] |  |  | 100
Energy-Related Contracts [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Mark-to-Market Derivative Assets | [4] | 11 |  | 29
Total Mark-to-Market Derivative (Liabilities) | [4] | (6) |  | (36)
Energy-Related Contracts [Member] | Quoted Market Prices of 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 | [4] | 11 |  | 29
Total Mark-to-Market Derivative (Liabilities) | [4] | (6) |  | (36)
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 | [4] | 514 |  | 527
Total Mark-to-Market Derivative (Liabilities) | [4] | (556) |  | (677)
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 | [4] | 514 |  | 527
Total Mark-to-Market Derivative (Liabilities) | [4] | (556) |  | 677
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 | [4] | 1 |  | 7
Total Mark-to-Market Derivative (Liabilities) | [4] | (3) |  | (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 | [4] | 1 |  | 7
Total Mark-to-Market Derivative (Liabilities) | [4] | (3) |  | (6)
Energy-Related Contracts [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Mark-to-Market Derivative Assets | [4] | 23 |  | 12
Total Mark-to-Market Derivative (Liabilities) | [4] | (14) |  | (15)
Energy-Related Contracts [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Mark-to-Market Derivative Assets | [4] | 23 |  | 12
Total Mark-to-Market Derivative (Liabilities) | [4] | (14) |  | (15)
Interest Rate Swap [Member] | Quoted Market Prices of 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 |  |
Total Mark-to-Market Derivative (Liabilities) | [5] | 0 |  |
Interest Rate Swap [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 |  |
Total Mark-to-Market Derivative (Liabilities) | [5] | (6) |  |
Interest Rate Swap [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 |  |
Total Mark-to-Market Derivative (Liabilities) | [5] | 0 |  |
Interest Rate Swap [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Mark-to-Market Derivative Assets | [5] | 1 |  |
Total Mark-to-Market Derivative (Liabilities) | [5] | (6) |  |
Cash and Cash Equivalents [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  |  |  | 0
Assets [Member] | Energy-Related Contracts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities | [6] | (503) |  | (551)
Assets [Member] | Energy-Related Contracts [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities | [6] | (503) |  | (551)
Assets [Member] | Interest Rate Swap [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities | [6] | 0 |  |
Other Liabilities [Member] | Energy-Related Contracts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities | [6] | 551 |  | 704
Other Liabilities [Member] | Energy-Related Contracts [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities | [6] | 551 |  | 704
Other Liabilities [Member] | Interest Rate Swap [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities | [6] | 0 |  |
Equity Securities [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 1,040 |  | 900
Equity Securities [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 1,040 |  | 900
US Treasury Securities [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 182 |  | 171
US Treasury Securities [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 182 |  | 171
Government Debt Securities [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 330 |  | 320
Government Debt Securities [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 330 |  | 320
Corporate Debt Obligations [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 497 |  | 487
Corporate Debt Obligations [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 497 |  | 487
Rabbi Trusts Equity Securities Mutual Funds [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 25 |  | 23
Rabbi Trusts Equity Securities Mutual Funds [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 6 |  | 6
Rabbi Trusts Equity Securities Mutual Funds [Member] | Total Estimate Of Fair Value [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 5 |  | 5
Rabbi Trusts US Treasury Obligations [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 68 |  | 69
Rabbi Trusts US Treasury Obligations [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 17 |  | 17
Rabbi Trusts US Treasury Obligations [Member] | Total Estimate Of Fair Value [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 13 |  | 14
Rabbi Trusts Debt Securities Government Obligations [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 42 |  | 40
Rabbi Trusts Debt Securities Government Obligations [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 11 |  | 10
Rabbi Trusts Debt Securities Government Obligations [Member] | Total Estimate Of Fair Value [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 8 |  | 8
Rabbi Trusts Debt Securities Other [Member] | Total Estimate Of Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 98 |  | 92
Rabbi Trusts Debt Securities Other [Member] | Total Estimate Of Fair Value [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 25 |  | 23
Rabbi Trusts Debt Securities Other [Member] | Total Estimate Of Fair Value [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 20 |  | 18
Rabbi Trusts Debt Securities Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts Debt Securities Other [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts Debt Securities Other [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts Debt Securities Other [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Other [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Other [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 98 |  | 92
Rabbi Trusts Debt Securities Other [Member] | Significant Other Observable Inputs (Level 2) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 25 |  | 23
Rabbi Trusts Debt Securities Other [Member] | Significant Other Observable Inputs (Level 2) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 20 |  | 18
Rabbi Trusts Debt Securities Other [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Other [Member] | Significant Unobservable Inputs (Level 3) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Other [Member] | Significant Unobservable Inputs (Level 3) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] |  |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 42 |  | 69
Rabbi Trusts Debt Securities Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 11 |  | 17
Rabbi Trusts Debt Securities Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 8 |  | 14
Rabbi Trusts Debt Securities Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] |  |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Debt Securities Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts US Treasury Obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  |  |  | 0
Rabbi Trusts US Treasury Obligations [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts US Treasury Obligations [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts US Treasury Obligations [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts US Treasury Obligations [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts US Treasury Obligations [Member] | Quoted Market Prices of Identical Assets (Level 1) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts US Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 68 |  | 40
Rabbi Trusts US Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 17 |  | 10
Rabbi Trusts US Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 13 |  | 8
Rabbi Trusts US Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts US Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts US Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measured on Recurring Basis, Investments | [7] | 0 |  | 0
Rabbi Trusts Equity Securities Mutual Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts Equity Securities Mutual Funds [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
Rabbi Trusts Equity Securities Mutual Funds [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Collateral netted against assets and liabilities |  | 0 |  | 0
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
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[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 on the Condensed Consolidated Balance Sheets. As of March 31, 2019 and December 31, 2018, Power had net cash collateral/margin payments to counterparties of $203 million and $393 million, respectively. Of these net cash/collateral margin payments, $48 million as of March 31, 2019 and $153 million as December 31, 2018 were netted against the corresponding net derivative contract positions. Of the $48 million as of March 31, 2019, $(9) million was netted against noncurrent assets and $57 million was netted against current liabilities. Of the $153 million as of December 31, 2018, $(2) million was netted against current assets, $(3) million was netted against noncurrent assets, $96 million was netted against current liabilities and $62 million was netted against noncurrent liabilities.
[2] | 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 March 31, 2019 and December 31, 2018.
[3] | Represents money market mutual funds.
[4] | 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.
[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] | Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. See Note 13. Financial Risk Management Activities for additional detail.
[7] | The NDT Fund maintains investments in various equity and fixed income securities. The Rabbi Trust maintains investments in a Russell 3000 index fund and various fixed income securities. 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 other equity securities in the NDT and Rabbi Trust Funds consist primarily of investments in 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 funds normally invest in diversified portfolios of high quality, short-term, dollar-denominated debt securities and government securities. The funds’ net asset value (NAV) is priced and published daily. The Rabbi Trust’s Russell 3000 index fund is valued based on quoted prices in an active market and can be redeemed daily without restriction.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.

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