Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Dec. 31, 2016
Commercial Paper		$ 315	$ 388
Commitments of Single Institution as Percentage of Total Commitments		8.00%
Line of Credit Facility, Remaining Borrowing Capacity		$ 3,619
Line of Credit Facility, Maximum Borrowing Capacity		4,200
Line of Credit Facility, Fair Value of Amount Outstanding		581
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,168
Line of Credit Facility, Maximum Borrowing Capacity		1,500	1,000
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	332
PSE And G [Member]
Line of Credit Facility, Remaining Borrowing Capacity		586
Line of Credit Facility, Maximum Borrowing Capacity		600
Line of Credit Facility, Fair Value of Amount Outstanding	[1]	14
Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		1,865
Line of Credit Facility, Maximum Borrowing Capacity		2,100	$ 2,600
Line of Credit Facility, Fair Value of Amount Outstanding		235
Five Year Credit Facility Maturing March 2022 [Member] | PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,168
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		332
Five Year Credit Facility Maturing March 2022 [Member] | PSE And G [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 586
Debt Instrument, Maturity Date, Description		Mar 2022
Line of Credit Facility, Maximum Borrowing Capacity		$ 600
Line of Credit Facility, Fair Value of Amount Outstanding		14
Five Year Credit Facility Maturing March 2022 [Member] | Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,802
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		98
Three Year Credit Facilities Maturing March 2020 [Member] | Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity		$ 63
Debt Instrument, Maturity Date, Description		Mar 2020
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
Line of Credit Facility, Fair Value of Amount Outstanding		137
Five Year Credit Facility Maturing on April 2020 [Member] | PSEG [Member]
Commercial Paper		$ 315
Short-term Debt, Weighted Average Interest Rate		1.25%

[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, 2017, PSEG had $315 million outstanding at a weighted average interest rate of 1.25%. As of March 31, 2017, PSE&G had no amounts outstanding under its Commercial Paper Program.