Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Commercial Paper		$ 1,151	$ 1,016
Commitments of Single Institution as Percentage of Total Commitments		9.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 2,875
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding		1,325
PSE And G [Member]
Commercial Paper		364	$ 272
Line of Credit Facility, Remaining Borrowing Capacity		220
Line of Credit Facility, Maximum Borrowing Capacity		600
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	380
Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,957
Line of Credit Facility, Maximum Borrowing Capacity		2,100
Line of Credit Facility, Fair Value of Amount Outstanding		143
Five Year Credit Facility Maturing March 2022 [Member] | PSE And G [Member]
Credit Facility Reduction in March 2022		4
Line of Credit Facility, Remaining Borrowing Capacity		$ 220
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		380
Five Year Credit Facility Maturing March 2022 [Member] | Power [Member]
Credit Facility Reduction in March 2022		12
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,861
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		39
Three Year Credit Facilities Maturing September 2021 [Member] | Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 96
Debt Instrument, Maturity Date, Description		Sept 2021
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
Line of Credit Facility, Fair Value of Amount Outstanding		104
Five Year Credit Facility Maturing March 2022 [Member] | PSE And G [Member]
Commercial Paper		$ 364
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.80%
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 698
Line of Credit Facility, Maximum Borrowing Capacity		1,500
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	802
PSEG [Member] | Five Year Credit Facility Maturing March 2022 [Member]
Credit Facility Reduction in March 2022		9
Line of Credit Facility, Remaining Borrowing Capacity		$ 698
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		802
PSEG [Member] | Five Year Credit Facility Maturing March 2022 [Member]
Commercial Paper		$ 787
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.92%

[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 March 31, 2019, PSEG had $787 million outstanding at a weighted average interest rate of 2.92%. PSE&G had $364 million outstanding at a weighted average interest rate of 2.80% under its Commercial Paper Program as of March 31, 2019.

[2] PSE&G facility will be reduced by $4 million in March 2022.

[3] Power facilities will be reduced by $12 million in March 2022.

[4] PSEG facilities will be reduced by $9 million in March 2022.