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v3.21.2

Debt and Credit Facilities (Changes in Long-Term Debt) (Detail) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2021 | Aug. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  |  | $ 1,325 | $ 2,450
Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  |  | 1,325 | $ 1,350
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 |
Pollution Control Notes Floating Rate Due On Two Thousand Fourteen | PSEG Power [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Long-term Debt |  | $ 44 |  |
Senior Notes863 Due On2031 | PSEG Power [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.63% |
Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three | PSEG Power [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.85% |
Senior Notes Four Point Three Percent Due Two Thousand Twenty Three | PSEG Power [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.30% |
Medium Term Notes One Point Nine Zero due Two Thousand Thirty One | Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  |  | $ 425 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.90% |
Subsequent Event [Member] | PSEG Power [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | $ 294 |  |  |
Write off of Deferred Debt Issuance Cost | 4 |  |  |
Subsequent Event [Member] | Senior Notes863 Due On2031 | PSEG Power [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Long-term Debt | 404 |  |  |
Subsequent Event [Member] | Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three | PSEG Power [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Long-term Debt | 700 |  |  |
Subsequent Event [Member] | Senior Notes Four Point Three Percent Due Two Thousand Twenty Three | PSEG Power [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of Long-term Debt | $ 250 |  |  |

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