Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Commercial Paper		$ 300		$ 1,115
Commitments of Single Institution as Percentage of Total Commitments		9.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,995
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	205
Proceeds from Short-Term Loan		800	$ 0
Repayments of Short-term Debt		500	$ 0
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		1,925
Line of Credit Facility, Maximum Borrowing Capacity		2,100
Line of Credit Facility, Fair Value of Amount Outstanding		175
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		$ 1,861
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		39
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
March 2020 Term Loan [Member]
Proceeds from Short-Term Loan		300
April 2020 Term Loan 1 [Member]
Proceeds from Short-Term Loan		200
Repayments of Short-term Debt		200
April 2020 Term Loan 2 [Member]
Proceeds from Short-Term Loan		300
Repayments of Short-term Debt		300
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,487
Line of Credit Facility, Maximum Borrowing Capacity		1,500
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	13
PSEG [Member] | Five Year Credit Facility Maturing March 2023 [Member]
Credit Facility Reduction in March 2022		9
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,487
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]	$ 13

[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, 2020, PSEG and PSE&G had no commercial paper outstanding.

[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.