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v3.21.1

Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | $ 900 | $ 600
Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | 900 | $ 600
Medium Term Notes Zero Point Nine Five due Two Thousand Twenty Six | Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | $ 450 |
Debt Instrument, Interest Rate, Stated Percentage | 0.95% |
Medium Term Notes Three Point Zero due Two Thousand Fifty One | Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | $ 450 |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% |
Medium Term Notes One Point Nine Zero Percent Due In Two Thousand Twenty One | Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.90% |
Repayments of Long-term Debt | $ 300 |

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