Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications out of AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax	$ (8)	$ (54)	$ 96
Amount Reclassified from Accumulated Other Comprehensive Income, Tax	1	17	(53)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(7)	(37)	43
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	13	(13)	134
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(5)	5	(69)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	8	(8)	65
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	8	(8)	65
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax	(17)	(41)	(41)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax	5	12	17
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax	(12)	(29)	(24)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(12)	(29)	(24)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax	(4)	0	3
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	1		(1)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	(3)		2
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(3)	0	2
Net Gains (Losses) on Trust Investments [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	13	(13)	134
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(5)	5	(69)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	8	(8)	65
Interest Expense [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax	(4)		3
Amount Reclassified from AOCI for Cash Flow Hedges, Tax	1		(1)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax	(3)		2
Non-Operating Pension and OPEB Credits (Costs) [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	26	6	10
Amortization of Prior Service (Cost) Credit, Tax	(7)	(2)	(4)
Amortization of Prior Service (Cost) Credit, After-Tax	19	4	6
Amortization of Actuarial Loss, Pre-Tax	(43)	(47)	(51)
Amortization of Actuarial Loss, Tax	12	14	21
Amortization of Actuarial Loss, After-Tax	(31)	(33)	(30)
PSEG Power LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax	(3)	(46)	90
Amount Reclassified from Accumulated Other Comprehensive Income, Tax	(1)	15	(51)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(4)	(31)	39
PSEG Power LLC \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	10	(11)	125
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(4)	5	(65)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	6	(6)	60
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	6	(6)	60
PSEG Power LLC \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax	(13)	(35)	(35)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax	3	10	14
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax	(10)	(25)	(21)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(10)	(25)	(21)
PSEG Power LLC \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	0	0	0
PSEG Power LLC \| Net Gains (Losses) on Trust Investments [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	10	(11)	125
Amount Reclassified from AOCI for Available for Sale Securities, Tax	(4)	5	(65)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	6	(6)	60
PSEG Power LLC \| Non-Operating Pension and OPEB Credits (Costs) [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	23	5	9
Amortization of Prior Service (Cost) Credit, Tax	(7)	(1)	(4)
Amortization of Prior Service (Cost) Credit, After-Tax	16	4	5
Amortization of Actuarial Loss, Pre-Tax	(36)	(40)	(44)
Amortization of Actuarial Loss, Tax	10	11	18
Amortization of Actuarial Loss, After-Tax	$ (26)	$ (29)	$ (26)

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