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Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 4,200 |
Line of Credit Facility, Amount Outstanding |  | 1,336 |
Available Liquidity |  | 2,864 |
Commercial Paper and Loans |  | $ 1,115 | $ 1,016
Commitments of single institution as percentage of total commitments |  | 9.00% |
PSEG [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,500 |
Line of Credit Facility, Amount Outstanding |  | 796 |
Available Liquidity |  | 704 |
Public Service Electric and Gas Company |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 600 |
Line of Credit Facility, Amount Outstanding |  | 379 |
Available Liquidity |  | 221 |
Commercial Paper and Loans |  | 362 | $ 272
PSEG Power LLC |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,100 |
Line of Credit Facility, Amount Outstanding |  | 161 |
Available Liquidity |  | 1,939 |
Revolving Credit Facility [Member] | PSEG [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Commercial Paper and Loans |  | $ 753 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 2.08% |
Revolving Credit Facility [Member] | Public Service Electric and Gas Company |  |  |
Short-term Debt [Line Items] |  |  |
Commercial Paper and Loans |  | $ 362 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  | 1.95% |
Letter of Credit Facilities expiring September 2021 [Member] | PSEG Power LLC |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200 |
Line of Credit Facility, Amount Outstanding |  | 121 |
Available Liquidity |  | $ 79 |
Expiration Date |  | Sept 2021 |
Revolving Credit Facility [Member] | PSEG [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Credit Facility Reduction in March 2023 |  | $ 9 |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | 1,500 |
Line of Credit Facility, Amount Outstanding |  | 796 |
Available Liquidity | [2] | $ 704 |
Expiration Date |  | Mar 2023 |
Revolving Credit Facility [Member] | Public Service Electric and Gas Company |  |  |
Short-term Debt [Line Items] |  |  |
Credit Facility Reduction in March 2023 |  | $ 4 |
Line of Credit Facility, Maximum Borrowing Capacity | [3] | 600 |
Line of Credit Facility, Amount Outstanding |  | 379 |
Available Liquidity | [2] | $ 221 |
Expiration Date |  | Mar 2023 |
Revolving Credit Facility [Member] | PSEG Power LLC |  |  |
Short-term Debt [Line Items] |  |  |
Credit Facility Reduction in March 2023 |  | $ 12 |
Line of Credit Facility, Maximum Borrowing Capacity | [4] | 1,900 |
Line of Credit Facility, Amount Outstanding |  | 40 |
Available Liquidity |  | $ 1,860 |
Expiration Date |  | Mar 2023 |
[1] | PSEG facilities will be reduced by $9 million in March 2022.
[2] | The primary use of PSEG’s and PSE&G’s credit facilities is to support their respective Commercial Paper Programs, under which as of December 31, 2019, PSEG had $753 million outstanding at a weighted average interest rate of 2.08%. PSE&G had $362 million outstanding at a weighted average interest rate of 1.95% under its Commercial Paper Program as of December 31, 2019.
[3] | PSE&G facility will be reduced by $4 million in March 2022
[4] | PSEG Power facilities will be reduced by $12 million in March 2022

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