Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		1 Months Ended	9 Months Ended
		Oct. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Commercial Paper			$ 3,705			$ 1,063
Commitments of Single Institution as Percentage of Total Commitments			8.00%
Line of Credit Facility, Remaining Borrowing Capacity			$ 2,752
Line of Credit Facility, Maximum Borrowing Capacity			4,100
Line of Credit Facility, Fair Value of Amount Outstanding	[1]		1,348
Proceeds from Short-Term Loan			2,500	$ 800
Repayments of Short-term Debt			300	500
Net Change in Commercial Paper and Loans			442	(1,115)
Public Service Electric and Gas Company [Member]
Commercial Paper			0			100
Line of Credit Facility, Remaining Borrowing Capacity			582
Line of Credit Facility, Maximum Borrowing Capacity			600
Line of Credit Facility, Fair Value of Amount Outstanding	[1]		18
Net Change in Commercial Paper and Loans			(100)	(362)
PSEG Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity			1,877
Line of Credit Facility, Maximum Borrowing Capacity			2,000
Line of Credit Facility, Fair Value of Amount Outstanding			123
Collateral Already Posted, Aggregate Fair Value			999		$ 343	$ 54
PSEG Power [Member] | Subsequent Event [Member]
Net Change in Commercial Paper and Loans		$ 755
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			$ 582
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]		18
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			$ 1,863
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			37
Letter of Credit Facilities expiring September 2022 | PSEG Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity			$ 14
Debt Instrument, Maturity Date, Description			Sept 2022
Line of Credit Facility, Maximum Borrowing Capacity			$ 100
Line of Credit Facility, Fair Value of Amount Outstanding			86
March 2020 Term Loan [Member]
Proceeds from Short-Term Loan				$ 300
Repayments of Short-term Debt			300
March 2021 Term Loan
Proceeds from Short-Term Loan			500
May 2021 Term Loan
Proceeds from Short-Term Loan			750
August 2021 Term Loan
Proceeds from Short-Term Loan			1,250
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity			293
Line of Credit Facility, Maximum Borrowing Capacity			1,500
Line of Credit Facility, Fair Value of Amount Outstanding	[1]		1,207
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Credit Facility Reduction in March 2022			9
Line of Credit Facility, Remaining Borrowing Capacity			$ 293
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]		$ 1,207

[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, 2021, PSEG had $1.2 billion outstanding at a weighted average interest rate of 0.22%. PSE&G had no Commercial Paper outstanding as of September 30, 2021.

[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.