Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	$ 386	$ 332	$ 478
Increases as a Result of Positions Taken in a Prior Period	12	87	82
Decreases as a Result of Positions Taken in a Prior Period	(62)	(50)	(190)
Increases as a Result of Positions Taken during the Current Period	19	28	30
Decreases as a Result of Positions Taken during the Current Period	0	(1)	(8)
Decreases as a Result of Settlements with Taxing Authorities	0	(10)	(60)
Decreases due to Lapses of Applicable Statute of Limitations	(27)	0	0
Total Amount of Unrecognized Tax Benefits at December	328	386	332
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(200)	(264)	(225)
Regulatory Asset-Unrecognized Tax Benefits	(31)	(27)	(27)
Amount of unrecognized tax benefits that would affect the effective tax rate	97	95	80
Power [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	111	70	156
Increases as a Result of Positions Taken in a Prior Period	6	28	17
Decreases as a Result of Positions Taken in a Prior Period	(1)	(6)	(80)
Increases as a Result of Positions Taken during the Current Period	12	23	9
Decreases as a Result of Positions Taken during the Current Period	0	0	(8)
Decreases as a Result of Settlements with Taxing Authorities	0	(4)	(24)
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	128	111	70
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(74)	(68)	(52)
Regulatory Asset-Unrecognized Tax Benefits	0	0	0
Amount of unrecognized tax benefits that would affect the effective tax rate	54	43	18
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	181	165	208
Increases as a Result of Positions Taken in a Prior Period	3	55	65
Decreases as a Result of Positions Taken in a Prior Period	(23)	(43)	(92)
Increases as a Result of Positions Taken during the Current Period	6	5	16
Decreases as a Result of Positions Taken during the Current Period	0	(1)	0
Decreases as a Result of Settlements with Taxing Authorities	0	0	(32)
Decreases due to Lapses of Applicable Statute of Limitations	(27)	0	0
Total Amount of Unrecognized Tax Benefits at December	140	181	165
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(106)	(162)	(138)
Regulatory Asset-Unrecognized Tax Benefits	(31)	(27)	(27)
Amount of unrecognized tax benefits that would affect the effective tax rate	3	(8)	0
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	93	95	110
Increases as a Result of Positions Taken in a Prior Period	2	4	0
Decreases as a Result of Positions Taken in a Prior Period	(38)	(1)	(18)
Increases as a Result of Positions Taken during the Current Period	0	0	5
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	0	(5)	(2)
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	57	93	95
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(20)	(34)	(35)
Regulatory Asset-Unrecognized Tax Benefits	0	0	0
Amount of unrecognized tax benefits that would affect the effective tax rate	$ 37	$ 59	$ 60