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v3.21.2

Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Debt Instrument [Line Items] |  |  |
Issuance of Long-term Debt |  | $ 900 | $ 975
Public Service Electric and Gas Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issuance of Long-term Debt |  | 900 | $ 975
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 |
First And Refunding Mortgage Bonds Nine Point Two Five Percentage Due On Two Twenty One | Public Service Electric and Gas Company [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 9.25% |
Repayments of Long-term Debt |  | $ 134 |
Senior Notes Four Point One Five Percentage Due Two Thousand Twenty One | PSEG Power [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.00% |
Repayments of Long-term Debt |  | $ 700 |
Senior Notes Three Point Zero Percent Due In Two Thousand Twenty One | PSEG Power [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.15% |
Repayments of Long-term Debt |  | $ 250 |
Subsequent Event [Member] | Pollution Control Notes Floating Rate Due On Two Thousand Fourteen | PSEG Power [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Long-term Debt | $ 44 |  |

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