Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	$ 130	$ 192	$ 147
Increases as a Result of Positions Taken in a Prior Period	16	9	58
Decreases as a Result of Positions Taken in a Prior Period	(25)	(40)	(19)
Increases as a Result of Positions Taken during the Current Period	0	1	6
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	(10)	(28)	0
Decreases due to Lapses of Applicable Statute of Limitations	(1)	(4)	0
Total Amount of Unrecognized Tax Benefits at December	110	130	192
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(29)	(37)	(76)
Regulatory Asset-Unrecognized Tax Benefits	(2)	(8)	(7)
Amount of unrecognized tax benefits that would affect the effective tax rate	79	85	109
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	29	27	30
Increases as a Result of Positions Taken in a Prior Period	2	2	8
Decreases as a Result of Positions Taken in a Prior Period	(12)	(2)	(12)
Increases as a Result of Positions Taken during the Current Period	0	1	1
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	(7)	0	0
Unrecognized Tax Benefit, Increase Resulting from		1
Decreases due to Lapses of Applicable Statute of Limitations			0
Increases due to Lapses of Applicable Statute of Limitations	(1)
Total Amount of Unrecognized Tax Benefits at December	11	29	27
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(7)	(15)	(15)
Regulatory Asset-Unrecognized Tax Benefits	(2)	(8)	(7)
Amount of unrecognized tax benefits that would affect the effective tax rate	$ 2	$ 6	$ 5