Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Commercial Paper		$ 346	$ 1,016
Commitments of Single Institution as Percentage of Total Commitments		9.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,649
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	551
Public Service Electric and Gas Company [Member]
Commercial Paper		10	$ 272
Line of Credit Facility, Remaining Borrowing Capacity		574
Line of Credit Facility, Maximum Borrowing Capacity		600
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	26
PSEG Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,924
Line of Credit Facility, Maximum Borrowing Capacity		2,100
Line of Credit Facility, Fair Value of Amount Outstanding		176
Five Year Credit Facility Maturing March 2023 [Member] | Public Service Electric and Gas Company [Member]
Credit Facility Reduction in March 2023		4
Line of Credit Facility, Remaining Borrowing Capacity		$ 574
Debt Instrument, Maturity Date, Description		Mar 2023
Line of Credit Facility, Maximum Borrowing Capacity	[2]	$ 600
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	26
Five Year Credit Facility Maturing March 2023 [Member] | PSEG Power [Member]
Credit Facility Reduction in March 2023		12
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,860
Debt Instrument, Maturity Date, Description		Mar 2023
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		$ 64
Debt Instrument, Maturity Date, Description		Sept 2021
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
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]
Commercial Paper		$ 10
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.17%
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,151
Line of Credit Facility, Maximum Borrowing Capacity		1,500
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	349
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Credit Facility Reduction in March 2023		9
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,151
Debt Instrument, Maturity Date, Description		Mar 2023
Line of Credit Facility, Maximum Borrowing Capacity	[4]	$ 1,500
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	349
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Commercial Paper		$ 336
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.44%

[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, 2019, PSEG had $336 million outstanding at a weighted average interest rate of 2.44%. PSE&G had $10 million outstanding at a weighted average interest rate of 2.17% under its Commercial Paper Program as of September 30, 2019.

[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.