Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Commercial Paper		$ 665		$ 1,063
Commitments of Single Institution as Percentage of Total Commitments		9.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,863
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	337
Proceeds from Short-Term Loan		500	$ 300
Repayments of Short-term Debt		300	0
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
PSEG Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,948
Line of Credit Facility, Maximum Borrowing Capacity		2,100
Line of Credit Facility, Fair Value of Amount Outstanding		152
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		$ 1,861
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		$ 68
Debt Instrument, Maturity Date, Description		Sept 2021
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Line of Credit Facility, Fair Value of Amount Outstanding		32
Letter of Credit Facilities expiring September 2022 | PSEG Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 19
Debt Instrument, Maturity Date, Description		Sept 2022
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Line of Credit Facility, Fair Value of Amount Outstanding		81
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
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,333
Line of Credit Facility, Maximum Borrowing Capacity		1,500
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	167
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Credit Facility Reduction in March 2022		9
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,333
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]	$ 167

[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 March 31, 2021, PSEG had $165 million outstanding at a weighted average interest rate of 0.23%. PSE&G had no Commercial Paper outstanding as of March 31, 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.