Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	$ 147	$ 321	$ 318
Increases as a Result of Positions Taken in a Prior Period	58	33	17
Decreases as a Result of Positions Taken in a Prior Period	(19)	(91)	(37)
Increases as a Result of Positions Taken during the Current Period	6	0	27
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	0	(116)	(4)
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	192	147	321
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(76)	(69)	(184)
Regulatory Asset-Unrecognized Tax Benefits	(7)	(15)	(46)
Amount of unrecognized tax benefits that would affect the effective tax rate	109	63	91
Public Service Electric and Gas Company
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	30	124	108
Increases as a Result of Positions Taken in a Prior Period	8	21	5
Decreases as a Result of Positions Taken in a Prior Period	(12)	(51)	(1)
Increases as a Result of Positions Taken during the Current Period	1	0	12
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	0	(64)	0
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	27	30	124
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(15)	(12)	(71)
Regulatory Asset-Unrecognized Tax Benefits	(7)	(15)	(46)
Amount of unrecognized tax benefits that would affect the effective tax rate	$ 5	$ 3	$ 7