Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	$ 332	$ 478	$ 402
Increases as a Result of Positions Taken in a Prior Period	87	82	83
Decreases as a Result of Positions Taken in a Prior Period	(50)	(190)	(30)
Increases as a Result of Positions Taken during the Current Period	28	30	23
Decreases as a Result of Positions Taken during the Current Period	(1)	(8)	0
Decreases as a Result of Settlements with Taxing Authorities	(10)	(60)	0
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	386	332	478
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(264)	(225)	(320)
Regulatory Asset-Unrecognized Tax Benefits	(27)	(27)	(30)
Amount of unrecognized tax benefits that would affect the effective tax rate	95	80	128
Power [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	70	156	134
Increases as a Result of Positions Taken in a Prior Period	28	17	33
Decreases as a Result of Positions Taken in a Prior Period	(6)	(80)	(19)
Increases as a Result of Positions Taken during the Current Period	23	9	8
Decreases as a Result of Positions Taken during the Current Period	0	(8)	0
Decreases as a Result of Settlements with Taxing Authorities	(4)	(24)	0
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	111	70	156
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(68)	(52)	(105)
Regulatory Asset-Unrecognized Tax Benefits	0	0	0
Amount of unrecognized tax benefits that would affect the effective tax rate	43	18	51
PSE&G [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	165	208	163
Increases as a Result of Positions Taken in a Prior Period	55	65	39
Decreases as a Result of Positions Taken in a Prior Period	(43)	(92)	(9)
Increases as a Result of Positions Taken during the Current Period	5	16	15
Decreases as a Result of Positions Taken during the Current Period	(1)	0	0
Decreases as a Result of Settlements with Taxing Authorities	0	(32)	0
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	181	165	208
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(162)	(138)	(177)
Regulatory Asset-Unrecognized Tax Benefits	(27)	(27)	(30)
Amount of unrecognized tax benefits that would affect the effective tax rate	(8)	0	1
Energy Holdings [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	95	110	101
Increases as a Result of Positions Taken in a Prior Period	4	0	11
Decreases as a Result of Positions Taken in a Prior Period	(1)	(18)	(2)
Increases as a Result of Positions Taken during the Current Period	0	5	0
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	(5)	(2)	0
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	93	95	110
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(34)	(35)	(37)
Regulatory Asset-Unrecognized Tax Benefits	0	0	0
Amount of unrecognized tax benefits that would affect the effective tax rate	$ 59	$ 60	$ 73