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Debt and Credit Facilities (Long-Term Debt Financing Transactions) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Commercial Paper |  | $ 1,063 |  | $ 1,115 |
Issuance of Long-Term Debt |  | 2,450 |  | 1,900 | $ 2,750
Long-term Debt |  | 16,293 |  |  |
PSEG [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 2,946 |  | 2,450 |
PSEG [Member] | Term Loan maturing in 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | 0 |  | 700 |
Repayments of Long-term Debt |  | 700 |  |  |
PSEG [Member] | Senior Notes Zero Point Eight Zero Percent Due In Two Thousand Twenty Five |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance of Long-Term Debt |  | 550 |  |  |
Long-term Debt |  | $ 550 |  | 0 |
Stated interest rate of debt instrument |  | 0.80% |  |  |
PSEG [Member] | Senior Notes One Point Six Zero Percent Due In Two Thousand Thirty |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance of Long-Term Debt |  | $ 550 |  |  |
Long-term Debt |  | $ 550 |  | 0 |
Stated interest rate of debt instrument |  | 1.60% |  |  |
PSEG [Member] | Senior Notes Eight Point Six Two Five Percent Due In Two Thousand Thirty One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | $ 96 | [1] | 0 |
Stated interest rate of debt instrument |  | 8.63% |  |  |
Public Service Electric and Gas Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commercial Paper |  | $ 100 |  | 362 |
Issuance of Long-Term Debt |  | 1,350 |  | 1,150 | 1,350
Long-term Debt |  | 10,999 |  | 9,908 |
Public Service Electric and Gas Company | Medium Term Notes Three Point Seven Zero Percent due Two Thousand Twenty Eight [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | [2] | $ 375 |  | 375 |
Stated interest rate of debt instrument |  | 3.70% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Four Point Zero Five Percent due Two Thousand Forty Eight [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | [2] | $ 325 |  | 325 |
Stated interest rate of debt instrument |  | 4.05% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Three Point Two Five Percent due Two Thousand Twenty Three [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | [2] | $ 325 |  | 325 |
Stated interest rate of debt instrument |  | 3.25% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Three Point Six Five Percent due Two Thousand Twenty Eight [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | [2] | $ 325 |  | 325 |
Stated interest rate of debt instrument |  | 3.65% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Three Point Two Zero Percent due Two Thousand Forty NIne [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | [2] | $ 400 |  | 400 |
Stated interest rate of debt instrument |  | 3.20% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Three Point Two Zero Percent due Two Thousand Twenty NIne [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | [2] | $ 375 |  | 375 |
Stated interest rate of debt instrument |  | 3.20% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Three Point Eight Five Percent due Two Thousand Forty Nine [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | [2] | $ 375 |  | 375 |
Stated interest rate of debt instrument |  | 3.85% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Two Point Four Five Percent due Two Thousand Thirty [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance of Long-Term Debt |  | $ 300 |  |  |
Stated interest rate of debt instrument |  | 2.45% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Three Point One Five Percent due Two Thousand Fifty [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance of Long-Term Debt |  | $ 300 |  |  |
Stated interest rate of debt instrument |  | 3.15% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Two Point Seven Zero Percent due Two Thousand Fifty [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance of Long-Term Debt |  | $ 375 |  |  |
Stated interest rate of debt instrument |  | 2.70% |  |  |
Public Service Electric and Gas Company | Medium Term Notes 2.05% due 2050 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance of Long-Term Debt |  | $ 375 |  |  |
Long-term Debt |  | $ 375 |  | 0 |
Stated interest rate of debt instrument |  | 2.05% |  |  |
Public Service Electric and Gas Company | Medium Term Notes Three Point Five Zero Percentage Due On Two Thousand Twenty [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | [2] | $ 0 |  | 250 |
Stated interest rate of debt instrument |  | 3.50% |  |  |
Repayments of Long-term Debt |  | $ 250 |  |  |
Public Service Electric and Gas Company | Medium Term Notes Seven Point Zero Four Percentage Due On Two Thousand Twenty [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt | [2] | $ 0 |  | 9 |
Stated interest rate of debt instrument |  | 7.04% |  |  |
Repayments of Long-term Debt |  | $ 9 |  |  |
PSEG Power LLC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance of Long-Term Debt |  | 0 |  | 0 | $ 700
Long-term Debt |  | 2,348 |  | 2,850 |
PSEG Power LLC | Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | $ 700 |  | 700 |
Stated interest rate of debt instrument |  | 3.85% |  |  |
PSEG Power LLC | Senior Notes Five Point One Three Percentage Due Two Thousand Twenty [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | $ 0 |  | 406 |
Stated interest rate of debt instrument |  | 5.13% |  |  |
Repayments of Long-term Debt |  | $ 406 |  |  |
PSEG Power LLC | Senior Notes Eight Point Six Three Percent Due Two Thousand Thirty One [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | $ 404 | [1] | $ 500 |
Stated interest rate of debt instrument |  | 8.63% |  |  |
Repayments of Long-term Debt |  | $ 96 |  |  |
[1] | In December 2020, PSEG issued $96 million principal amount of 8.63% Senior Notes due 2031 to holders of a like principal amount of 8.63% Senior Notes due 2031 originally issued by PSEG Power who validly tendered their notes pursuant to an offer to exchange. Upon consummation of the offer to exchange, the PSEG Power notes accepted in the exchange were cancelled. The transaction resulted in a non-cash financing activity for both PSEG and PSEG Power.
[2] | Secured by essentially all property of PSE&G pursuant to its First and Refunding Mortgage.

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