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Recent Accounting Standards New Standards Adopted (Details) - Subsequent Event [Member] - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2018 | Jan. 01, 2018
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Pre-tax adjustment for new accounting standard |  | $ 342
After-tax adjustment for new accounting standard |  | $ 176
Minimum [Member] | PSE&G [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs | $ 55 |
Maximum [Member] | PSE&G [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Estimated Change in Expense related to new presentation of pension and OPEB costs | $ 65 |

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