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v3.20.2

Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | $ 975 | $ 1,500
Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | 975 | $ 750
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% |
Medium Term Notes Two Point Seven Zero Percent due Two Thousand Fifty [Member] | Public Service Electric and Gas Company [Member] |  |
Debt Instrument [Line Items] |  |
Issuance of Long-term Debt | $ 375 |
Debt Instrument, Interest Rate, Stated Percentage | 2.70% |
Senior Notes Five Point One Three Percentage Due Two Thousand Twenty [Member] | PSEG Power [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.13% |
Repayments of Long-term Debt | $ 406 |

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