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Debt and Credit Facilities - Changes in Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  | $ 3,350 | $ 2,800 | $ 2,850
Proceeds from Short-Term Loans |  | 400 | 750 | 2,000
Repayments of Long-term Debt |  | 1,500 | 1,575 | 700
December 2024 Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from Short-Term Loans | $ 400 |  |  |
Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  | 2,100 | 1,800 | 900
Repayments of Long-term Debt |  | 750 | $ 825 | $ 0
PSEG Power | December 2024 Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from Short-Term Loans | $ 1,250 |  |  |
Senior Notes Five Point Two Zero Due Two Thousand Twenty Nine [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  | $ 750 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.20% | 5.20% |  |
Senior Notes Five Point Four Five due Two Thousand Thirty Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  | $ 500 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.45% | 5.45% |  |
Senior Notes Two Point Eight Eight Percent due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.88% | 2.88% |  |
Repayments of Long-term Debt |  | $ 750 |  |
Medium Term Notes Five Point Two Zero due Two Thousand Thirty Four [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  | $ 450 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.20% | 5.20% |  |
Medium Term Notes Five Point Four Five Percent due Two Thousand Fifty Four [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  | $ 550 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.45% | 5.45% |  |
Medium Term Notes Four Point Eight Five Percent due Two Thousand Thirty Four [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  | $ 600 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.85% | 4.85% |  |
Medium Term Notes Five Point Three Zero Percent due Two Thousand Fifty Four [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of Long-term Debt |  | $ 500 |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.30% | 5.30% |  |
Medium Term Notes Three Point Seven Five Percent due Two Thousand Twenty Four [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% |  |
Repayments of Long-term Debt |  | $ 250 |  |
Medium Term Notes Three Point One Five Percent due Two Thousand Twenty Four [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.15% | 3.15% |  |
Repayments of Long-term Debt |  | $ 250 |  |
Medium-Term Notes Three Point Zero Five Percent Due in Two Thousand Twenty Four [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.05% | 3.05% |  |
Repayments of Long-term Debt |  | $ 250 |  |

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