Debt and Credit Facilities Debt and Credit Facilities (Short-Term Liquidity) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Commitments of Single Institution as Percentage of Total Commitments	7.00%
Line of Credit Facility, Remaining Borrowing Capacity	$ 3,927
Line of Credit Facility, Maximum Borrowing Capacity	4,153
Line of Credit Facility, Fair Value of Amount Outstanding	226
PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity	990
Line of Credit Facility, Maximum Borrowing Capacity	1,000
Line of Credit Facility, Fair Value of Amount Outstanding	10	[1]
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	14	[1]
Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity	2,351
Line of Credit Facility, Maximum Borrowing Capacity	2,553
Line of Credit Facility, Fair Value of Amount Outstanding	202
Five Year Credit Facility Maturing on April 2019 [Member] | PSEG [Member]
Line of Credit Facility, Remaining Borrowing Capacity	$ 490
Debt Instrument, Maturity Date, Description	Apr 2019
Line of Credit Facility, Maximum Borrowing Capacity	$ 500
Line of Credit Facility, Fair Value of Amount Outstanding	10	[1]
Five Year Credit Facility Maturing on April 2019 [Member] | Power [Member]
Line of Credit Facility, Remaining Borrowing Capacity	$ 1,411
Debt Instrument, Maturity Date, Description	Apr 2019
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,600
Line of Credit Facility, Fair Value of Amount Outstanding	189
Five Year Credit Facility Maturing on April 2020 [Member] | PSEG [Member]
Credit Facility Reduction in March 2018	12
Line of Credit Facility, Remaining Borrowing Capacity	$ 500
Debt Instrument, Maturity Date, Description	Apr 2020
Line of Credit Facility, Maximum Borrowing Capacity	$ 500	[2]
Line of Credit Facility, Fair Value of Amount Outstanding	0	[1]
Five Year Credit Facility Maturing on April 2020 [Member] | PSE And G [Member]
Credit Facility Reduction in March 2018	14
Line of Credit Facility, Remaining Borrowing Capacity	$ 586
Debt Instrument, Maturity Date, Description	Apr 2020
Line of Credit Facility, Maximum Borrowing Capacity	$ 600	[3]
Line of Credit Facility, Fair Value of Amount Outstanding	14	[1]
Five Year Credit Facility Maturing on April 2020 [Member] | Power [Member]
Credit Facility Reduction in March 2018	24
Line of Credit Facility, Remaining Borrowing Capacity	$ 940
Debt Instrument, Maturity Date, Description	Apr 2020
Line of Credit Facility, Maximum Borrowing Capacity	$ 953	[4]
Line of Credit Facility, Fair Value of Amount Outstanding	$ 13

[1] The primary use of PSEG's and PSE&G's credit facilities is to support their respective CP Programs. PSEG and PSE&G had no amounts outstanding under their respective CP Programs as of June 30, 2016.

[2] PSEG facility will be reduced by $12 million in March 2018.

[3] PSE&G facility will be reduced by $14 million in March 2018.

[4] Power facility will be reduced by $24 million in March 2018.