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Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | $ 600 | $ 0
Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | 600 | $ 0
Medium Term Notes Two Point Four Five Percent due Two Thousand Thirty [Member] | Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | $ 300 |
Debt Instrument, Interest Rate, Stated Percentage | 2.45% |
Medium Term Notes Three Point One Five Percent due Two Thousand Fifty [Member] | Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | $ 300 |
Debt Instrument, Interest Rate, Stated Percentage | 3.15% |

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