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Pension, OPEB and Savings Plans (Fair Value Measurements And The Levels Of Inputs Used In Determining Fair Values) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | $ 5,599 |  | $ 5,405
Interest and dividend receivables |  | 14 |  | 8
Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [2] | 107 |  | 96
Equity Securities [Member] | Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 944 |  | 816
Equity Securities [Member] | Preferred Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 1 |  |
Equities Commingled - US [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3],[4] | 1,387 |  | 1,463
Government-Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 263 |  | 279
US Treasury Obligations [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 441 |  | 322
Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 836 |  | 906
Subtotal before Measured at Net Asset Value Practical Expedient [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3,979 |  | 3,882
Commingled Equities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,604 |  | 1,504
Private Equity [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [6] | 16 |  | 19
Quoted Market Prices for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] |  |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [2] | 105 |  | 95
Quoted Market Prices for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 944 |  | 816
Quoted Market Prices for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Preferred Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 1 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Equities Commingled - US [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3],[4] | 1,247 |  | 1,269
Quoted Market Prices for Identical Assets (Level 1) [Member] | Government-Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0 |  | 0
Quoted Market Prices for Identical Assets (Level 1) [Member] | US Treasury Obligations [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0 |  | 0
Quoted Market Prices for Identical Assets (Level 1) [Member] | Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0 |  | 0
Quoted Market Prices for Identical Assets (Level 1) [Member] | Subtotal before Measured at Net Asset Value Practical Expedient [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,297 |  | 2,180
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [2] | 2 |  | 1
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 0 |  | 0
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Preferred Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] | Equities Commingled - US [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3],[4] | 140 |  | 194
Significant Other Observable Inputs (Level 2) [Member] | Government-Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 263 |  | 279
Significant Other Observable Inputs (Level 2) [Member] | US Treasury Obligations [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 441 |  | 322
Significant Other Observable Inputs (Level 2) [Member] | Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 836 |  | 906
Significant Other Observable Inputs (Level 2) [Member] | Subtotal before Measured at Net Asset Value Practical Expedient [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,682 |  | 1,702
Significant Other Observable Inputs (Level 2) [Member] | Other Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  |  |  | 1,698
Pension And OPEB Plans Level 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] |  |  |
Pension And OPEB Plans Level 3 [Member] | Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0
Pension And OPEB Plans Level 3 [Member] | Equity Securities [Member] | Common Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 0 |  | 0
Pension And OPEB Plans Level 3 [Member] | Equity Securities [Member] | Preferred Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 0 |  |
Pension And OPEB Plans Level 3 [Member] | Equities Commingled - US [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3],[4] | 0 |  | 0
Pension And OPEB Plans Level 3 [Member] | Government-Other [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0 |  | 0
Pension And OPEB Plans Level 3 [Member] | US Treasury Obligations [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 | [5] | 0
Pension And OPEB Plans Level 3 [Member] | Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [5] | 0 |  | 0
Pension And OPEB Plans Level 3 [Member] | Subtotal before Measured at Net Asset Value Practical Expedient [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 |  | 0
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 134 |  | 97
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Equities Commingled - US [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [7] | 96 |  | 68
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Fixed Income Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [7] | 38 |  | 29
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 |  | 0
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] | Equities Commingled - US [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [7] | 0 |  | 0
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] | Fixed Income Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [7] | 0 |  | 0
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 134 |  | 97
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equities Commingled - US [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [7] | 96 |  | 68
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [7] | 38 |  | 29
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension And OPEB Plans Level 3 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 0 |  | 0
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension And OPEB Plans Level 3 [Member] | Equities Commingled - US [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [7] | 0 |  | 0
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension And OPEB Plans Level 3 [Member] | Fixed Income Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [7] | $ 0 |  | $ 0
[1] | Excludes net receivable of $14 million and $8 million at December 31, 2016 and 2015, respectively, which consists of interest and dividend, receivables and payables related to pending securities sales and purchases.
[2] | Certain open-ended mutual funds with mainly short-term investments are valued based on unadjusted quoted prices in active market (Level 1). Certain temporary investments are valued using inputs such as time-to-maturity, coupon rate, quality rating and current yield (Level 2).
[3] | Common stocks and preferred stocks are measured using observable data in active markets and considered Level 1. Investments in certain commingled equity funds are measured at their published daily net asset value (NAV) available to investors; if they are redeemable daily without restrictions, they are classified as Level 1 or, if they have restrictions which prevent daily redemptions, they are classified as Level 2.
[4] | In 2016, PSEG re-evaluated the classification, within the fair value hierarchy, of its commingled equity funds. As a result, PSEG determined that certain commingled funds in the amount of $1,698 million at December 31, 2015 should have been classified as Level 2 instead of Level 1, as previously presented for 2015, due to the funds having certain redemption restrictions which prevent daily redemptions at their published price. PSEG has determined that this error is immaterial to its previously filed financial reports and, accordingly, has corrected the error by revising the amounts disclosed for 2015 to report such investments as Level 2. In addition, as part of our implementation of the new accounting guidance on investments measured at fair value using NAV as a practical expedient in 2016, the majority of these same commingled equity funds have been removed from the fair value hierarchy as they are measured at fair value using the NAV per share (or its equivalent) practical expedient. See Note 2. Recent Accounting Standards. These funds do not meet the definition of readily determinable fair value due to limitations in published NAV (last business day of the month) and include certain redemption restrictions ranging from one to fifteen days advance notice prior to redemption days and limitations on withdrawals over 25% of the total fund. The objectives of these funds are mainly tracking the S&P Index or achieving long-term growth through investment in foreign equity securities and the MSCI Emerging Markets Index. As a result of the error correction for the $1,698 million that should have been classified as Level 2 for 2015 and $1,504 million that was removed from the fair value hierarchy as part of the new guidance on NAV practical expedient implementation, $194 million has been reclassified to Level 2 as of December 31, 2015.
[5] | Fixed income securities include mainly investment grade corporate and municipal bonds, US Treasury obligations and Federal Agency asset-backed securities with a wide range of maturities. These investments are valued using an evaluated pricing approach 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 or the most recent quoted for similar securities which are a Level 2 measure.
[6] | Private equity investments include various limited partnerships that invest in operating companies through acquisitions or developing a portfolio of non-US distressed investments. These investments are valued at NAV on an annual basis and have significant redemption restrictions preventing redemption until fund liquidation and limited ability to sell these investments. These investments have been removed from the fair value hierarchy in accordance with the new guidance on NAV practical expedient.
[7] | Investments in commingled equity and bond funds have a readily determinable fair value as they publish a daily NAV available to investors which is the basis for current transactions and contain certain redemption restrictions requiring advance notice of one to two days for withdrawals (Level 2). In 2016, PSEG re-evaluated the classification, within the fair value hierarchy, of its commingled funds. As a result, PSEG determined that the commingled equity funds should have been classified as Level 2 instead of Level 1, as previously presented for 2015, due to the funds having certain redemption restrictions which prevent daily redemptions at the published price. In addition to the advance notice of one or two days, redemption days may be limited to twice per month for certain funds. PSEG has determined that this error is immaterial to its previously filed financial reports and, accordingly, has corrected the error by revising the amounts disclosed for 2015 to report the commingled equity fund balance of $68 million as of December 31, 2015 as Level 2.

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