Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2020	Dec. 31, 2019
Commercial Paper		$ 1,165	$ 1,115
Commitments of Single Institution as Percentage of Total Commitments		9.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,639
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	561
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		1,964
Line of Credit Facility, Maximum Borrowing Capacity		2,100
Line of Credit Facility, Fair Value of Amount Outstanding		136
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		$ 104
Debt Instrument, Maturity Date, Description		Sept 2021
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
Line of Credit Facility, Fair Value of Amount Outstanding		96
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,092
Line of Credit Facility, Maximum Borrowing Capacity		1,500
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	408
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Credit Facility Reduction in March 2022		9
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,092
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]	408
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Commercial Paper		$ 365
Short-term Debt, Weighted Average Interest Rate, at Point in Time		0.40%

[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 June 30, 2020, PSEG had $365 million outstanding at a weighted average interest rate of 0.4%. PSE&G had no commercial paper outstanding under its Commercial Paper Program as of June 30, 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.