Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	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		950
Available Liquidity		3,250
Commercial Paper and Loans		$ 1,063	$ 1,115
Commitments of single institution as percentage of total commitments		9.00%
Proceeds from Short-term Debt		$ 800	0	$ 0
Repayments of Short-term Debt		500	0	$ 0
PSEG [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,500
Line of Credit Facility, Amount Outstanding		665
Available Liquidity		835
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		117
Available Liquidity		483
Commercial Paper and Loans		100	$ 362
PSEG Power LLC
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,100
Line of Credit Facility, Amount Outstanding		168
Available Liquidity		1,932
Revolving Credit Facility [Member] | PSEG [Member]
Short-term Debt [Line Items]
Commercial Paper and Loans		$ 663
Short-term Debt, Weighted Average Interest Rate, at Point in Time		0.33%
Revolving Credit Facility [Member] | Public Service Electric and Gas Company
Short-term Debt [Line Items]
Commercial Paper and Loans		$ 100
Short-term Debt, Weighted Average Interest Rate, at Point in Time		0.28%
March 2020 Term Loan [Member]
Short-term Debt [Line Items]
Proceeds from Short-term Debt		$ 300
Repayments of Short-term Debt		300
April 2020 Term Loan 1 [Member]
Short-term Debt [Line Items]
Proceeds from Short-term Debt		200
Repayments of Short-term Debt		200
April 2020 Term Loan 2 [Member]
Short-term Debt [Line Items]
Repayments of Short-term Debt		300
Letter of Credit Facilities expiring September 2021 [Member] | PSEG Power LLC
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		100
Line of Credit Facility, Amount Outstanding		48
Available Liquidity		$ 52
Expiration Date		Sept 2021
Revolving Credit Facility [Member] | PSEG [Member]
Short-term Debt [Line Items]
Credit Facility Reduction		$ 9
Line of Credit Facility, Maximum Borrowing Capacity	[1]	1,500
Line of Credit Facility, Amount Outstanding	[2]	665
Available Liquidity		$ 835
Expiration Date		Mar 2024
Revolving Credit Facility [Member] | Public Service Electric and Gas Company
Short-term Debt [Line Items]
Credit Facility Reduction		$ 4
Line of Credit Facility, Maximum Borrowing Capacity	[3]	600
Line of Credit Facility, Amount Outstanding	[2]	117
Available Liquidity		$ 483
Expiration Date		Mar 2024
Revolving Credit Facility [Member] | PSEG Power LLC
Short-term Debt [Line Items]
Credit Facility Reduction		$ 12
Line of Credit Facility, Maximum Borrowing Capacity	[4]	1,900
Line of Credit Facility, Amount Outstanding		39
Available Liquidity		$ 1,861
Expiration Date		Mar 2024
Letter of Credit Facilities expiring September 2022 | PSEG Power LLC
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Line of Credit Facility, Amount Outstanding		81
Available Liquidity		$ 19
Expiration Date		Sept 2022

[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, 2020, PSEG had $663 million outstanding at a weighted average interest rate of 0.33%. PSE&G had $100 million outstanding at a weighted average interest rate of 0.28% under its Commercial Paper Program as of December 31, 2020.

[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