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Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Commercial Paper |  |  | $ 3,705 |  |  | $ 1,063
Commitments of Single Institution as Percentage of Total Commitments |  |  | 8.00% |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 2,752 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 4,100 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] |  | 1,348 |  |  |
Proceeds from Short-Term Loan |  |  | 2,500 | $ 800 |  |
Repayments of Short-term Debt |  |  | 300 | 500 |  |
Net Change in Commercial Paper and Loans |  |  | 442 | (1,115) |  |
Public Service Electric and Gas Company [Member] |  |  |  |  |  |
Commercial Paper |  |  | 0 |  |  | 100
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 582 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 600 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] |  | 18 |  |  |
Net Change in Commercial Paper and Loans |  |  | (100) | (362) |  |
PSEG Power [Member] |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 1,877 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 2,000 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | 123 |  |  |
Collateral Already Posted, Aggregate Fair Value |  |  | 999 |  | $ 343 | $ 54
PSEG Power [Member] | Subsequent Event [Member] |  |  |  |  |  |
Net Change in Commercial Paper and Loans |  | $ 755 |  |  |  |
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 |  |  | $ 582 |  |  |
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] |  | 18 |  |  |
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 |  |  | $ 1,863 |  |  |
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 |  |  | 37 |  |  |
Letter of Credit Facilities expiring September 2022 | PSEG Power [Member] |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 14 |  |  |
Debt Instrument, Maturity Date, Description |  |  | Sept 2022 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 100 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | 86 |  |  |
March 2020 Term Loan [Member] |  |  |  |  |  |
Proceeds from Short-Term Loan |  |  |  | $ 300 |  |
Repayments of Short-term Debt |  |  | 300 |  |  |
March 2021 Term Loan |  |  |  |  |  |
Proceeds from Short-Term Loan |  |  | 500 |  |  |
May 2021 Term Loan |  |  |  |  |  |
Proceeds from Short-Term Loan |  |  | 750 |  |  |
August 2021 Term Loan |  |  |  |  |  |
Proceeds from Short-Term Loan |  |  | 1,250 |  |  |
PSEG [Member] |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 293 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 1,500 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding | [1] |  | 1,207 |  |  |
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member] |  |  |  |  |  |
Credit Facility Reduction in March 2022 |  |  | 9 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | $ 293 |  |  |
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] |  | $ 1,207 |  |  |
[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, 2021, PSEG had $1.2 billion outstanding at a weighted average interest rate of 0.22%. PSE&G had no Commercial Paper outstanding as of September 30, 2021.
[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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