Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ (2)	$ 2	$ (10)	$ 14
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	0	(2)	2	(8)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2)	0	(8)	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)	(5)	(3)	(11)	$ (14)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	(4)	(2)	(8)	$ (10)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	(1)	(1)	(3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1)	(4)	(2)	(8)
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)	(15)	(12)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	1	4	3
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(4)	(3)	(11)	(9)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	(3)	(11)	(9)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	4	11	8	37
Reclassification for Available for Sale Securities, Tax	(1)	(4)	(3)	(14)
Reclassification for Available for Sale Securities, After-Tax	3	7	5	23
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	3	7	5	23
PSEG Power [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(1)	6	(5)	21
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	0	(3)	1	(10)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	3	(4)	11
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)	(11)	(9)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	1	3	2
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(3)	(2)	(8)	(7)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(3)	(2)	(8)	(7)
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	3	9	6	30
Reclassification for Available for Sale Securities, Tax	(1)	(4)	(2)	(12)
Reclassification for Available for Sale Securities, After-Tax	2	5	4	18
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	2	5	4	18
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)	(5)	(3)	(11)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	1	1	3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1)	4	(2)	(8)
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	5	6	16	18
Amortization of Prior Service (Cost) Credit, Tax	(2)	(2)	(5)	(5)
Amortization of Prior Service (Cost) Credit, After-Tax	3	4	11	13
Amortization of Actuarial Loss, Pre-Tax	(10)	(10)	(31)	(30)
Amortization of Actuarial Loss, Tax	3	3	9	8
Amortization of Actuarial Loss, After-Tax	(7)	(7)	(22)	(22)
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	5	15	16
Amortization of Prior Service (Cost) Credit, Tax	(1)	(2)	(4)	(5)
Amortization of Prior Service (Cost) Credit, After-Tax	4	3	11	11
Amortization of Actuarial Loss, Pre-Tax	(9)	(8)	(26)	(25)
Amortization of Actuarial Loss, Tax	2	3	7	7
Amortization of Actuarial Loss, After-Tax	(7)	(5)	(19)	(18)
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	4	11	8	37
Reclassification for Available for Sale Securities, Tax	(1)	(4)	(3)	(14)
Reclassification for Available for Sale Securities, After-Tax	3	7	5	23
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	3	9	6	30
Reclassification for Available for Sale Securities, Tax	(1)	(4)	(2)	(12)
Reclassification for Available for Sale Securities, After-Tax	$ 2	$ 5	$ 4	$ 18

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