Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Operating Revenues	$ 2,302	$ 2,394	$ 7,598	$ 7,228
Operating Expenses	1,812	1,840	6,162	5,431
Operating Income (Loss)	490	554	1,436	1,797
Equity Earnings (Losses) of Subsidiaries	3	5	10	12
Net Gains (Losses) on Trust Investments	(3)	45	164	31
Other Income (Deductions)	35	33	101	99
Non-Operating Pension and OPEB Credits (Costs)	55	19	121	57
Interest Expense	(147)	(127)	(417)	(341)
Income Tax Benefit (Expense)	(30)	(117)	(159)	(416)
Net Income	403	412	1,256	1,239
Net Cash Provided By (Used In) Operating Activities			2,709	2,492
Net Cash Provided By (Used In) Investing Activities			(2,359)	(3,113)
Net Cash Provided By (Used In) Financing Activities			(393)	412
Current Assets	3,059		3,059			$ 3,507
Property, Plant and Equipment, net	35,407		35,407			34,363
Noncurrent Assets	8,349		8,349			7,456
Total Assets	46,815		46,815			45,326
Current Liabilities	4,067		4,067			4,935
Noncurrent Liabilities	13,375		13,375			12,846
Long-Term Debt	14,448		14,448			13,168
Member's Equity	14,925	14,359	14,925	14,359	$ 14,754	14,377	$ 14,158	$ 13,847
TOTAL LIABILITIES AND CAPITALIZATION	46,815		46,815			45,326
PSEG Power [Member]
Debt Instrument [Line Items]
Operating Revenues	771	868	3,270	3,038
Operating Expenses	692	756	2,976	2,555
Operating Income (Loss)	79	112	294	483
Equity Earnings (Losses) of Subsidiaries	3	5	10	12
Net Gains (Losses) on Trust Investments	(4)	44	160	30
Other Income (Deductions)	15	14	43	38
Non-Operating Pension and OPEB Credits (Costs)	8	4	14	11
Interest Expense	(34)	(29)	(85)	(47)
Income Tax Benefit (Expense)	(14)	(25)	(127)	(127)
Net Income	53	125	309	400
Net Cash Provided By (Used In) Operating Activities			1,362	1,005
Net Cash Provided By (Used In) Investing Activities			(585)	(1,010)
Net Cash Provided By (Used In) Financing Activities			(719)	14
Current Assets	1,431		1,431			1,507
Property, Plant and Equipment, net	8,495		8,495			8,842
Noncurrent Assets	2,627		2,627			2,245
Total Assets	12,553		12,553			12,594
Current Liabilities	1,026		1,026			842
Noncurrent Liabilities	3,321		3,321			3,001
Long-Term Debt	2,433		2,433			2,791
Member's Equity	5,773	5,967	5,773	5,967	$ 6,000	5,960	$ 6,039	$ 5,967
TOTAL LIABILITIES AND CAPITALIZATION	12,553		12,553			12,594
Power Senior Notes [Member] | Consolidating Adjustments [Member]
Debt Instrument [Line Items]
Operating Revenues	(55)	(40)	(142)	(105)
Operating Expenses	(55)	(40)	(142)	(105)
Operating Income (Loss)	0	0	0	0
Equity Earnings (Losses) of Subsidiaries	(59)	(110)	(335)	(392)
Net Gains (Losses) on Trust Investments	0	0	0	0
Other Income (Deductions)	(80)	(71)	(257)	(196)
Non-Operating Pension and OPEB Credits (Costs)	0	0	0	0
Interest Expense	80	71	257	196
Income Tax Benefit (Expense)	0	0	0	0
Net Income	(59)	(110)	(335)	(392)
Comprehensive Income (Loss)	(65)	(106)	(369)	(375)
Net Cash Provided By (Used In) Operating Activities			(229)	117
Net Cash Provided By (Used In) Investing Activities			222	829
Net Cash Provided By (Used In) Financing Activities			7	(946)
Current Assets	(4,497)		(4,497)			(4,593)
Property, Plant and Equipment, net	0		0			0
Investment in Subsidiaries	(6,262)		(6,262)			(6,169)
Noncurrent Assets	(304)		(304)			(238)
Total Assets	(11,063)		(11,063)			(11,000)
Current Liabilities	(4,497)		(4,497)			(4,593)
Noncurrent Liabilities	(304)		(304)			(238)
Long-Term Debt	0		0			0
Member's Equity	(6,262)		(6,262)			(6,169)
TOTAL LIABILITIES AND CAPITALIZATION	(11,063)		(11,063)			(11,000)
Power Senior Notes [Member] | Guarantor Subsidiaries [Member]
Debt Instrument [Line Items]
Operating Revenues	748	849	3,212	2,982
Operating Expenses	672	733	2,914	2,493
Operating Income (Loss)	76	116	298	489
Equity Earnings (Losses) of Subsidiaries	(10)	(7)	(28)	(14)
Net Gains (Losses) on Trust Investments	(5)	45	158	31
Other Income (Deductions)	53	45	166	118
Non-Operating Pension and OPEB Credits (Costs)	7	4	13	10
Interest Expense	(27)	(28)	(82)	(64)
Income Tax Benefit (Expense)	(30)	(64)	(175)	(179)
Net Income	64	111	350	391
Comprehensive Income (Loss)	70	107	384	374
Net Cash Provided By (Used In) Operating Activities			1,345	1,169
Net Cash Provided By (Used In) Investing Activities			(708)	(1,132)
Net Cash Provided By (Used In) Financing Activities			(640)	(32)
Current Assets	1,459		1,459			1,479
Property, Plant and Equipment, net	4,484		4,484			4,971
Investment in Subsidiaries	1,078		1,078			1,107
Noncurrent Assets	2,526		2,526			2,109
Total Assets	9,547		9,547			9,666
Current Liabilities	2,467		2,467			2,971
Noncurrent Liabilities	2,216		2,216			1,996
Long-Term Debt	0		0			0
Member's Equity	4,864		4,864			4,699
TOTAL LIABILITIES AND CAPITALIZATION	9,547		9,547			9,666
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member]
Debt Instrument [Line Items]
Operating Revenues	78	59	200	161
Operating Expenses	75	61	201	162
Operating Income (Loss)	3	(2)	(1)	(1)
Equity Earnings (Losses) of Subsidiaries	3	5	10	12
Net Gains (Losses) on Trust Investments	0	(1)	0	(1)
Other Income (Deductions)	0	0	0	0
Non-Operating Pension and OPEB Credits (Costs)	1	0	1	1
Interest Expense	(16)	(7)	(36)	(18)
Income Tax Benefit (Expense)	4	4	11	8
Net Income	(5)	(1)	(15)	1
Comprehensive Income (Loss)	(5)	(1)	(15)	1
Net Cash Provided By (Used In) Operating Activities			75	(26)
Net Cash Provided By (Used In) Investing Activities			(253)	(290)
Net Cash Provided By (Used In) Financing Activities			170	320
Current Assets	327		327			304
Property, Plant and Equipment, net	3,967		3,967			3,822
Investment in Subsidiaries	0		0			0
Noncurrent Assets	116		116			101
Total Assets	4,410		4,410			4,227
Current Liabilities	2,153		2,153			2,027
Noncurrent Liabilities	859		859			730
Long-Term Debt	0		0			0
Member's Equity	1,398		1,398			1,470
TOTAL LIABILITIES AND CAPITALIZATION	4,410		4,410			4,227
Power Senior Notes [Member] | Power Parent [Member]
Debt Instrument [Line Items]
Operating Revenues	0	0	0	0
Operating Expenses	0	2	3	5
Operating Income (Loss)	0	(2)	(3)	(5)
Equity Earnings (Losses) of Subsidiaries	69	117	363	406
Net Gains (Losses) on Trust Investments	1	0	2	0
Other Income (Deductions)	42	40	134	116
Non-Operating Pension and OPEB Credits (Costs)	0	0	0	0
Interest Expense	(71)	(65)	(224)	(161)
Income Tax Benefit (Expense)	12	35	37	44
Net Income	53	125	309	400
Comprehensive Income (Loss)	48	128	338	400
Net Cash Provided By (Used In) Operating Activities			171	(255)
Net Cash Provided By (Used In) Investing Activities			154	(417)
Net Cash Provided By (Used In) Financing Activities			(256)	672
Current Assets	4,142		4,142			4,317
Property, Plant and Equipment, net	44		44			49
Investment in Subsidiaries	5,184		5,184			5,062
Noncurrent Assets	289		289			273
Total Assets	9,659		9,659			9,701
Current Liabilities	903		903			437
Noncurrent Liabilities	550		550			513
Long-Term Debt	2,433		2,433			2,791
Member's Equity	5,773		5,773			5,960
TOTAL LIABILITIES AND CAPITALIZATION	9,659		9,659			9,701
Power Senior Notes [Member] | PSEG Power [Member]
Debt Instrument [Line Items]
Operating Revenues	771	868	3,270	3,038
Operating Expenses	692	756	2,976	2,555
Operating Income (Loss)	79	112	294	483
Equity Earnings (Losses) of Subsidiaries	3	5	10	12
Net Gains (Losses) on Trust Investments	(4)	44	160	30
Other Income (Deductions)	15	14	43	38
Non-Operating Pension and OPEB Credits (Costs)	8	4	14	11
Interest Expense	(34)	(29)	(85)	(47)
Income Tax Benefit (Expense)	(14)	(25)	(127)	(127)
Net Income	53	125	309	400
Comprehensive Income (Loss)	48	$ 128	338	400
Net Cash Provided By (Used In) Operating Activities			1,362	1,005
Net Cash Provided By (Used In) Investing Activities			(585)	(1,010)
Net Cash Provided By (Used In) Financing Activities			(719)	$ 14
Current Assets	1,431		1,431			1,507
Property, Plant and Equipment, net	8,495		8,495			8,842
Investment in Subsidiaries	0		0			0
Noncurrent Assets	2,627		2,627			2,245
Total Assets	12,553		12,553			12,594
Current Liabilities	1,026		1,026			842
Noncurrent Liabilities	3,321		3,321			3,001
Long-Term Debt	2,433		2,433			2,791
Member's Equity	5,773		5,773			5,960
TOTAL LIABILITIES AND CAPITALIZATION	$ 12,553		$ 12,553			$ 12,594