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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 2	$ 2	$ 14	$ (6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	(2)	(3)	(8)	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	(1)	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	(5)	(1)	(11)	(2)	$ (4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	(1)	(8)	(1)	$ (3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(1)	0	(3)	(1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(4)	(1)	(8)	(1)
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)	(12)	(13)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	0	3	3
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(3)	(3)	(9)	(10)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(3)	(3)	(9)	(10)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	11	6	37	9
Reclassification for Available for Sale Securities, Tax	(4)	(3)	(14)	(4)
Reclassification for Available for Sale Securities, After-Tax	7	3	23	5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	7	3	23	5
PSEG Power [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	6	2	21	(4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	(3)	(1)	(10)	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	3	1	11	(4)
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	(3)	(3)	(9)	(11)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	1	2	3
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(2)	(2)	(7)	(8)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2)	(2)	(7)	(8)
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	9	5	30	7
Reclassification for Available for Sale Securities, Tax	(4)	(2)	(12)	(3)
Reclassification for Available for Sale Securities, After-Tax	5	3	18	4
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	5	3	18	4
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	(5)	(1)	(11)	(2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(1)	0	(3)	1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(4)	1	(8)	(1)
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	7	18	20
Amortization of Prior Service (Cost) Credit, Tax	(2)	(2)	(5)	(6)
Amortization of Prior Service (Cost) Credit, After-Tax	4	5	13	14
Amortization of Actuarial Loss, Pre-Tax	(10)	(10)	(30)	(33)
Amortization of Actuarial Loss, Tax	3	2	8	9
Amortization of Actuarial Loss, After-Tax	(7)	(8)	(22)	(24)
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	16	17
Amortization of Prior Service (Cost) Credit, Tax	(2)	(2)	(5)	(5)
Amortization of Prior Service (Cost) Credit, After-Tax	3	4	11	12
Amortization of Actuarial Loss, Pre-Tax	(8)	(9)	(25)	(28)
Amortization of Actuarial Loss, Tax	3	3	7	8
Amortization of Actuarial Loss, After-Tax	(5)	(6)	(18)	(20)
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	11	6	37	9
Reclassification for Available for Sale Securities, Tax	(4)	(3)	(14)	(4)
Reclassification for Available for Sale Securities, After-Tax	7	3	23	5
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	9	5	30	7
Reclassification for Available for Sale Securities, Tax	(4)	(2)	(12)	(3)
Reclassification for Available for Sale Securities, After-Tax	$ 5	$ 3	$ 18	$ 4

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