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Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Commercial Paper |  | $ 300 |  | $ 1,115
Commitments of Single Institution as Percentage of Total Commitments |  | 9.00% |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 3,995 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 4,200 |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 205 |  |
Proceeds from Short-Term Loan |  | 800 | $ 0 |
Repayments of Short-term Debt |  | 500 | $ 0 |
Public Service Electric and Gas Company [Member] |  |  |  |
Commercial Paper |  | 0 |  | $ 362
Line of Credit Facility, Remaining Borrowing Capacity |  | 583 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 600 |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 17 |  |
PSEG Power [Member] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 1,925 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,100 |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 175 |  |
Five Year Credit Facility Maturing March 2023 [Member] | Public Service Electric and Gas Company [Member] |  |  |  |
Credit Facility Reduction in March 2022 |  | 4 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 583 |  |
Debt Instrument, Maturity Date, Description |  | Mar 2024 |  |
Line of Credit Facility, Maximum Borrowing Capacity | [2] | $ 600 |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 17 |  |
Five Year Credit Facility Maturing March 2023 [Member] | PSEG Power [Member] |  |  |  |
Credit Facility Reduction in March 2022 |  | 12 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,861 |  |
Debt Instrument, Maturity Date, Description |  | Mar 2024 |  |
Line of Credit Facility, Maximum Borrowing Capacity | [3] | $ 1,900 |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 39 |  |
Three Year Credit Facilities Maturing September 2021 [Member] | PSEG Power [Member] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 64 |  |
Debt Instrument, Maturity Date, Description |  | Sept 2021 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200 |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 136 |  |
March 2020 Term Loan [Member] |  |  |  |
Proceeds from Short-Term Loan |  | 300 |  |
April 2020 Term Loan 1 [Member] |  |  |  |
Proceeds from Short-Term Loan |  | 200 |  |
Repayments of Short-term Debt |  | 200 |  |
April 2020 Term Loan 2 [Member] |  |  |  |
Proceeds from Short-Term Loan |  | 300 |  |
Repayments of Short-term Debt |  | 300 |  |
PSEG [Member] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 1,487 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,500 |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | 13 |  |
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member] |  |  |  |
Credit Facility Reduction in March 2022 |  | 9 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 1,487 |  |
Debt Instrument, Maturity Date, Description |  | Mar 2024 |  |
Line of Credit Facility, Maximum Borrowing Capacity | [4] | $ 1,500 |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] | $ 13 |  |
[1] | The primary use of PSEG’s and PSE&G’s credit facilities is to support their respective Commercial Paper Programs, under which as of September 30, 2020, PSEG and PSE&G had no commercial paper outstanding.
[2] | PSE&G facility will be reduced by $4 million in March 2022.
[3] | PSEG Power facilities will be reduced by $12 million in March 2022.
[4] | PSEG facilities will be reduced by $9 million in March 2022.

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