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Income Taxes (Narrative) (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Income Taxes [Line Items] |
NJ tax surcharge percent for 2018 to 2019 | 1.50%
NJ tax surcharge percent for 2020 to 2021 | 2.50%
NJ tax surcharge percent through 2023 | 2.50%
Public Service Electric and Gas Company [Member] |
Income Taxes [Line Items] |
Operating Loss Carryforwards | $ 23

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