Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ (5)	$ 9	$ (8)	$ 12
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	1	(5)	2	(6)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	4	(6)	6
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(1)	(4)	(2)	(6)	$ (14)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	(3)	(1)	(4)	$ (10)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(1)	(1)	(1)	(2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	(3)	(1)	(4)
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	(5)	(4)	(10)	(8)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	1	3	2
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(4)	(3)	(7)	(6)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	(3)	(7)	(6)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	1	17	4	26
Reclassification for Available for Sale Securities, Tax	(1)	(7)	(2)	(10)
Reclassification for Available for Sale Securities, After-Tax	0	10	2	16
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	10	2	16
PSEG Power [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(3)	11	(4)	15
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	1	(5)	1	(7)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2)	6	(3)	8
PSEG Power [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0	0	0
PSEG Power [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	(4)	(3)	(7)	(6)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	0	2	1
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(3)	(3)	(5)	(5)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(3)	(3)	(5)	(5)
PSEG Power [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	1	14	3	21
Reclassification for Available for Sale Securities, Tax	0	(5)	(1)	(8)
Reclassification for Available for Sale Securities, After-Tax	1	9	2	13
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1	9	2	13
Interest Expense [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(1)	(4)	(2)	(6)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(1)	1	(1)	2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	3	(1)	(4)
Non-Operating Pension and OPEB Credits (Costs) [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	6	6	11	12
Amortization of Prior Service (Cost) Credit, Tax	(2)	(1)	(3)	(3)
Amortization of Prior Service (Cost) Credit, After-Tax	4	5	8	9
Amortization of Actuarial Loss, Pre-Tax	(11)	(10)	(21)	(20)
Amortization of Actuarial Loss, Tax	3	2	6	5
Amortization of Actuarial Loss, After-Tax	(8)	(8)	(15)	(15)
Non-Operating Pension and OPEB Credits (Costs) [Member] \| PSEG Power [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	5	6	10	11
Amortization of Prior Service (Cost) Credit, Tax	(2)	(2)	(3)	(3)
Amortization of Prior Service (Cost) Credit, After-Tax	3	4	7	8
Amortization of Actuarial Loss, Pre-Tax	(9)	(9)	(17)	(17)
Amortization of Actuarial Loss, Tax	3	2	5	4
Amortization of Actuarial Loss, After-Tax	(6)	(7)	(12)	(13)
Net Gains (Losses) on Trust Investments [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	1	17	4	26
Reclassification for Available for Sale Securities, Tax	(1)	(7)	(2)	(10)
Reclassification for Available for Sale Securities, After-Tax	0	10	2	16
Net Gains (Losses) on Trust Investments [Member] \| PSEG Power [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	1	14	3	21
Reclassification for Available for Sale Securities, Tax	0	(5)	(1)	(8)
Reclassification for Available for Sale Securities, After-Tax	$ 1	$ 9	$ 2	$ 13

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