Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Dec. 31, 2019
Commercial Paper		$ 1,062	$ 1,115
Commitments of Single Institution as Percentage of Total Commitments		9.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,223
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	977
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		1,946
Line of Credit Facility, Maximum Borrowing Capacity		2,100
Line of Credit Facility, Fair Value of Amount Outstanding		154
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		$ 1,860
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		40
Three Year Credit Facilities Maturing September 2021 [Member] | PSEG Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 86
Debt Instrument, Maturity Date, Description		Sept 2021
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
Line of Credit Facility, Fair Value of Amount Outstanding		114
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		694
Line of Credit Facility, Maximum Borrowing Capacity		1,500
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	806
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Credit Facility Reduction in March 2022		9
Line of Credit Facility, Remaining Borrowing Capacity		$ 694
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]	806
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Commercial Paper		$ 762
Short-term Debt, Weighted Average Interest Rate, at Point in Time		3.40%

[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, 2020, PSEG had $762 million outstanding at a weighted average interest rate of 3.4%. PSE&G had no commercial paper outstanding under its Commercial Paper Program as of March 31, 2020.

[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.