Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Commercial Paper		$ 0	$ 388
Commitments of Single Institution as Percentage of Total Commitments		8.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,982
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding		218
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,487
Line of Credit Facility, Maximum Borrowing Capacity		1,500	1,000
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	13
PSE And G [Member]
Line of Credit Facility, Remaining Borrowing Capacity		585
Line of Credit Facility, Maximum Borrowing Capacity		600
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	15
Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,910
Line of Credit Facility, Maximum Borrowing Capacity		2,100	$ 2,600
Line of Credit Facility, Fair Value of Amount Outstanding		190
Five Year Credit Facility Maturing March 2022 [Member] | PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,487
Debt Instrument, Maturity Date, Description		Mar 2022
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500
Line of Credit Facility, Fair Value of Amount Outstanding		13
Five Year Credit Facility Maturing March 2022 [Member] | PSE And G [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 585
Debt Instrument, Maturity Date, Description		Mar 2022
Line of Credit Facility, Maximum Borrowing Capacity		$ 600
Line of Credit Facility, Fair Value of Amount Outstanding		15
Five Year Credit Facility Maturing March 2022 [Member] | Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,850
Debt Instrument, Maturity Date, Description		Mar 2022
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,900
Line of Credit Facility, Fair Value of Amount Outstanding		50
Three Year Credit Facilities Maturing March 2020 [Member] | Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 60
Debt Instrument, Maturity Date, Description		Mar 2020
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
Line of Credit Facility, Fair Value of Amount Outstanding		$ 140

[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 June 30, 2017, neither PSEG nor PSE&G had amounts outstanding.