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Recent Accounting Standards Recent Accounting Standards (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Mar. 31, 2019 | Sep. 30, 2019
Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification of deferred rent liabilities and incentives | $ 21 |
Accounting Standards Update 2018-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | $ 81
Public Service Electric and Gas Company [Member] | Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 91 |
PSEG Power [Member] | Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 46 |
PSEG Power [Member] | Accounting Standards Update 2018-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | $ 69
Operating Lease Right of Use Assets [Member] | Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 261 |
Operating Lease Liabilities [Member] | Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 282 |

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