Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	$ 334	$ 328	$ 386
Increases as a Result of Positions Taken in a Prior Period	11	40	12
Decreases as a Result of Positions Taken in a Prior Period	(70)	(32)	(62)
Increases as a Result of Positions Taken during the Current Period	52	12	19
Decreases as a Result of Positions Taken during the Current Period	(3)	(1)	0
Decreases as a Result of Settlements with Taxing Authorities	(6)	0	0
Decreases due to Lapses of Applicable Statute of Limitations	0	(13)	(27)
Total Amount of Unrecognized Tax Benefits at December	318	334	328
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(173)	(157)	(200)
Regulatory Asset-Unrecognized Tax Benefits	(46)	(56)	(31)
Amount of unrecognized tax benefits that would affect the effective tax rate	99	121	97
Power [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	142	128	111
Increases as a Result of Positions Taken in a Prior Period	4	18	6
Decreases as a Result of Positions Taken in a Prior Period	(37)	(10)	(1)
Increases as a Result of Positions Taken during the Current Period	48	6	12
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	(6)	0	0
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	151	142	128
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(104)	(72)	(74)
Regulatory Asset-Unrecognized Tax Benefits	0	0	0
Amount of unrecognized tax benefits that would affect the effective tax rate	47	70	54
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	135	140	181
Increases as a Result of Positions Taken in a Prior Period	4	15	3
Decreases as a Result of Positions Taken in a Prior Period	(31)	(11)	(23)
Increases as a Result of Positions Taken during the Current Period	3	5	6
Decreases as a Result of Positions Taken during the Current Period	(3)	(1)	0
Decreases as a Result of Settlements with Taxing Authorities	0	0	0
Decreases due to Lapses of Applicable Statute of Limitations	0	(13)	(27)
Total Amount of Unrecognized Tax Benefits at December	108	135	140
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(57)	(73)	(106)
Regulatory Asset-Unrecognized Tax Benefits	(46)	(56)	(31)
Amount of unrecognized tax benefits that would affect the effective tax rate	5	6	3
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	53	57	93
Increases as a Result of Positions Taken in a Prior Period	3	8	2
Decreases as a Result of Positions Taken in a Prior Period	(2)	(13)	(38)
Increases as a Result of Positions Taken during the Current Period	0	1	0
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	0	0	0
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	54	53	57
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(12)	(12)	(20)
Regulatory Asset-Unrecognized Tax Benefits	0	0	0
Amount of unrecognized tax benefits that would affect the effective tax rate	$ 42	$ 41	$ 37