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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ 2	$ (12)	$ (6)	$ (39)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	(3)	3	0	12
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	(9)	(6)	(27)
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)		(2)		$ 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	0	(1)	0	$ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0		(1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1)		(1)
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	(3)	(10)	(13)	(31)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	0	3	3	9
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(3)	(7)	(10)	(22)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(3)	(7)	(10)	(22)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	6	(2)	9	(8)
Reclassification for Available for Sale Securities, Tax	(3)	0	(4)	3
Reclassification for Available for Sale Securities, After-Tax	3	(2)	5	(5)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	3	(2)	5	(5)
PSEG Power [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2	(11)	(4)	(34)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	(1)	3	0	11
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1	(8)	(4)	(23)
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)	(10)	(11)	(27)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	3	3	8
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(2)	(7)	(8)	(19)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2)	(7)	(8)	(19)
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	5	(1)	7	(7)
Reclassification for Available for Sale Securities, Tax	(2)	0	(3)	3
Reclassification for Available for Sale Securities, After-Tax	3	(1)	4	(4)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	3	(1)	4	(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	(1)		(2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0		(1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1)		(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			20	3
Amortization of Prior Service (Cost) Credit, Tax			(6)	0
Amortization of Prior Service (Cost) Credit, After-Tax			14	3
Amortization of Actuarial Loss, Pre-Tax			(33)	(34)
Amortization of Actuarial Loss, Tax			9	9
Amortization of Actuarial Loss, After-Tax			(24)	(25)
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			17	3
Amortization of Prior Service (Cost) Credit, Tax			(5)	0
Amortization of Prior Service (Cost) Credit, After-Tax			12	3
Amortization of Actuarial Loss, Pre-Tax			(28)	(30)
Amortization of Actuarial Loss, Tax			8	8
Amortization of Actuarial Loss, After-Tax			(20)	(22)
Operating Expense [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	7	1
Amortization of Prior Service (Cost) Credit, Tax	(2)	0
Amortization of Prior Service (Cost) Credit, After-Tax	5	1
Amortization of Actuarial Loss, Pre-Tax	(10)	(11)
Amortization of Actuarial Loss, Tax	2	3
Amortization of Actuarial Loss, After-Tax	(8)	(8)
Operating Expense [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	6	1
Amortization of Prior Service (Cost) Credit, Tax	(2)	0
Amortization of Prior Service (Cost) Credit, After-Tax	4	1
Amortization of Actuarial Loss, Pre-Tax	(9)	(11)
Amortization of Actuarial Loss, Tax	3	3
Amortization of Actuarial Loss, After-Tax	(6)	(8)
Other Income [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	6	(2)
Reclassification for Available for Sale Securities, Tax	(3)	0
Reclassification for Available for Sale Securities, After-Tax	3	(2)
Other Income [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	5	(1)
Reclassification for Available for Sale Securities, Tax	(2)	0
Reclassification for Available for Sale Securities, After-Tax	$ 3	$ (1)
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			9	(8)
Reclassification for Available for Sale Securities, Tax			(4)	3
Reclassification for Available for Sale Securities, After-Tax			5	(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			7	(7)
Reclassification for Available for Sale Securities, Tax			(3)	3
Reclassification for Available for Sale Securities, After-Tax			$ 4	$ (4)