Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017	Dec. 31, 2016
Commercial Paper		$ 202	$ 388
Commitments of Single Institution as Percentage of Total Commitments		8.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,788
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding		412
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,285
Line of Credit Facility, Maximum Borrowing Capacity		1,500	1,000
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	215
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		1,918
Line of Credit Facility, Maximum Borrowing Capacity		2,100	$ 2,600
Line of Credit Facility, Fair Value of Amount Outstanding		182
Five Year Credit Facility Maturing March 2022 [Member] | PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,285
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		215
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		$ 1,830
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		70
Three Year Credit Facilities Maturing March 2020 [Member] | Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 88
Debt Instrument, Maturity Date, Description		Mar 2020
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
Line of Credit Facility, Fair Value of Amount Outstanding		112
Five Year Credit Facility Maturing on April 2020 [Member] | PSEG [Member]
Commercial Paper		$ 202
Short-term Debt, Weighted Average Interest Rate		1.37%

[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, 2017, PSEG had $202 million outstanding at a weighted average interest rate of 1.37%. PSE&G had