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