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Recent Accounting Standards Recent Accounting Standards (Details) - USD ($) $ in Millions | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect Adjustment |  | $ (2) | $ 81
Public Service Electric and Gas Company [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect Adjustment |  | $ (2) |
PSEG Power [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect Adjustment |  |  | $ 69
Allowance for Credit Losses [Member] | Accounting Standards Update 2016-13 [Member] | Public Service Electric and Gas Company [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect Adjustment | $ 8 |  |
Other Regulatory Assets (Liabilities) [Member] | Accounting Standards Update 2016-13 [Member] | Public Service Electric and Gas Company [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect Adjustment | 6 |  |
Other Assets [Member] | Accounting Standards Update 2016-13 [Member] | Public Service Electric and Gas Company [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect Adjustment | $ 2 |  |

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