Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Operating Revenues	$ 2,316	$ 2,016	$ 5,296	$ 4,834
Operating Expenses	2,156	1,605	4,350	3,591
Operating Income (Loss)	160	411	946	1,243
Equity Earnings (Losses) of Subsidiaries	5	5	7	7
Net Gains (Losses) on Trust Investments	39	8	167	(14)
Other Income (Deductions)	33	34	66	66
Non-Operating Pension and OPEB Credits (Costs)	33	19	66	38
Interest Expense	(137)	(111)	(270)	(214)
Income Tax Benefit (Expense)	20	(97)	(129)	(299)
Net Income	153	269	853	827
Net Cash Provided By (Used In) Operating Activities			1,824	1,633
Net Cash Provided By (Used In) Investing Activities			(1,622)	(2,027)
Net Cash Provided By (Used In) Financing Activities			(286)	190
Current Assets	3,156		3,156			$ 3,507
Property, Plant and Equipment, net	34,877		34,877			34,363
Noncurrent Assets	8,247		8,247			7,456
Total Assets	46,280		46,280			45,326
Current Liabilities	3,982		3,982			4,935
Noncurrent Liabilities	13,243		13,243			12,846
Long-Term Debt	14,301		14,301			13,168
Member's Equity	14,754	14,158	14,754	14,158	$ 14,814	14,377	$ 14,104	$ 13,847
TOTAL LIABILITIES AND CAPITALIZATION	46,280		46,280			45,326
PSEG Power [Member]
Debt Instrument [Line Items]
Operating Revenues	1,083	767	2,499	2,170
Operating Expenses	1,169	725	2,284	1,799
Operating Income (Loss)	(86)	42	215	371
Equity Earnings (Losses) of Subsidiaries	5	5	7	7
Net Gains (Losses) on Trust Investments	38	8	164	(14)
Other Income (Deductions)	15	13	28	24
Non-Operating Pension and OPEB Credits (Costs)	3	3	6	7
Interest Expense	(26)	(11)	(51)	(18)
Income Tax Benefit (Expense)	11	(19)	(113)	(102)
Net Income	(40)	41	256	275
Net Cash Provided By (Used In) Operating Activities			1,150	869
Net Cash Provided By (Used In) Investing Activities			(714)	(1,095)
Net Cash Provided By (Used In) Financing Activities			(444)	214
Current Assets	1,567		1,567			1,507
Property, Plant and Equipment, net	8,469		8,469			8,842
Noncurrent Assets	2,668		2,668			2,245
Total Assets	12,704		12,704			12,594
Current Liabilities	1,025		1,025			842
Noncurrent Liabilities	3,248		3,248			3,001
Long-Term Debt	2,431		2,431			2,791
Member's Equity	6,000	6,039	6,000	6,039	$ 6,022	5,960	$ 6,196	$ 5,967
TOTAL LIABILITIES AND CAPITALIZATION	12,704		12,704			12,594
Power Senior Notes [Member] | Consolidating Adjustments [Member]
Debt Instrument [Line Items]
Operating Revenues	(46)	(31)	(87)	(65)
Operating Expenses	(46)	(31)	(87)	(65)
Operating Income (Loss)	0	0	0	0
Equity Earnings (Losses) of Subsidiaries	25	(51)	(276)	(282)
Net Gains (Losses) on Trust Investments	0	0	0	0
Other Income (Deductions)	(88)	(68)	(177)	(125)
Non-Operating Pension and OPEB Credits (Costs)	0	0	0	0
Interest Expense	88	68	177	125
Income Tax Benefit (Expense)	0	0	0	0
Net Income	25	(51)	(276)	(282)
Comprehensive Income (Loss)	12	(48)	(304)	(269)
Net Cash Provided By (Used In) Operating Activities			(78)	98
Net Cash Provided By (Used In) Investing Activities			1,051	808
Net Cash Provided By (Used In) Financing Activities			(973)	(906)
Current Assets	(5,516)		(5,516)			(4,593)
Property, Plant and Equipment, net	0		0			0
Investment in Subsidiaries	(6,369)		(6,369)			(6,169)
Noncurrent Assets	(261)		(261)			(238)
Total Assets	(12,146)		(12,146)			(11,000)
Current Liabilities	(5,516)		(5,516)			(4,593)
Noncurrent Liabilities	(261)		(261)			(238)
Long-Term Debt	0		0			0
Member's Equity	(6,369)		(6,369)			(6,169)
TOTAL LIABILITIES AND CAPITALIZATION	(12,146)		(12,146)			(11,000)
Power Senior Notes [Member] | Guarantor Subsidiaries [Member]
Debt Instrument [Line Items]
Operating Revenues	1,063	747	2,464	2,133
Operating Expenses	1,148	704	2,242	1,760
Operating Income (Loss)	(85)	43	222	373
Equity Earnings (Losses) of Subsidiaries	(10)	(4)	(18)	(7)
Net Gains (Losses) on Trust Investments	38	8	163	(14)
Other Income (Deductions)	58	40	113	73
Non-Operating Pension and OPEB Credits (Costs)	3	2	6	6
Interest Expense	(24)	(19)	(55)	(36)
Income Tax Benefit (Expense)	(1)	(23)	(145)	(115)
Net Income	(21)	47	286	280
Comprehensive Income (Loss)	(8)	44	314	267
Net Cash Provided By (Used In) Operating Activities			1,213	745
Net Cash Provided By (Used In) Investing Activities			(1,100)	(867)
Net Cash Provided By (Used In) Financing Activities			(116)	123
Current Assets	1,964		1,964			1,479
Property, Plant and Equipment, net	4,452		4,452			4,971
Investment in Subsidiaries	1,090		1,090			1,107
Noncurrent Assets	2,510		2,510			2,109
Total Assets	10,016		10,016			9,666
Current Liabilities	2,936		2,936			2,971
Noncurrent Liabilities	2,143		2,143			1,996
Long-Term Debt	0		0			0
Member's Equity	4,937		4,937			4,699
TOTAL LIABILITIES AND CAPITALIZATION	10,016		10,016			9,666
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member]
Debt Instrument [Line Items]
Operating Revenues	66	51	122	102
Operating Expenses	65	49	126	101
Operating Income (Loss)	1	2	(4)	1
Equity Earnings (Losses) of Subsidiaries	5	5	7	7
Net Gains (Losses) on Trust Investments	0	0	0	0
Other Income (Deductions)	0	0	0	0
Non-Operating Pension and OPEB Credits (Costs)	0	1	0	1
Interest Expense	(12)	(6)	(20)	(11)
Income Tax Benefit (Expense)	2	2	7	4
Net Income	(4)	4	(10)	2
Comprehensive Income (Loss)	(4)	4	(10)	2
Net Cash Provided By (Used In) Operating Activities			81	(8)
Net Cash Provided By (Used In) Investing Activities			(220)	(196)
Net Cash Provided By (Used In) Financing Activities			134	191
Current Assets	315		315			304
Property, Plant and Equipment, net	3,971		3,971			3,822
Investment in Subsidiaries	0		0			0
Noncurrent Assets	138		138			101
Total Assets	4,424		4,424			4,227
Current Liabilities	2,167		2,167			2,027
Noncurrent Liabilities	827		827			730
Long-Term Debt	0		0			0
Member's Equity	1,430		1,430			1,470
TOTAL LIABILITIES AND CAPITALIZATION	4,424		4,424			4,227
Power Senior Notes [Member] | Power Parent [Member]
Debt Instrument [Line Items]
Operating Revenues	0	0	0	0
Operating Expenses	2	3	3	3
Operating Income (Loss)	(2)	(3)	(3)	(3)
Equity Earnings (Losses) of Subsidiaries	(15)	55	294	289
Net Gains (Losses) on Trust Investments	0	0	1	0
Other Income (Deductions)	45	41	92	76
Non-Operating Pension and OPEB Credits (Costs)	0	0	0	0
Interest Expense	(78)	(54)	(153)	(96)
Income Tax Benefit (Expense)	10	2	25	9
Net Income	(40)	41	256	275
Comprehensive Income (Loss)	(22)	43	290	272
Net Cash Provided By (Used In) Operating Activities			(66)	34
Net Cash Provided By (Used In) Investing Activities			(445)	(840)
Net Cash Provided By (Used In) Financing Activities			511	806
Current Assets	4,804		4,804			4,317
Property, Plant and Equipment, net	46		46			49
Investment in Subsidiaries	5,279		5,279			5,062
Noncurrent Assets	281		281			273
Total Assets	10,410		10,410			9,701
Current Liabilities	1,438		1,438			437
Noncurrent Liabilities	539		539			513
Long-Term Debt	2,431		2,431			2,791
Member's Equity	6,002		6,002			5,960
TOTAL LIABILITIES AND CAPITALIZATION	10,410		10,410			9,701
Power Senior Notes [Member] | PSEG Power [Member]
Debt Instrument [Line Items]
Operating Revenues	1,083	767	2,499	2,170
Operating Expenses	1,169	725	2,284	1,799
Operating Income (Loss)	(86)	42	215	371
Equity Earnings (Losses) of Subsidiaries	5	5	7	7
Net Gains (Losses) on Trust Investments	38	8	164	(14)
Other Income (Deductions)	15	13	28	24
Non-Operating Pension and OPEB Credits (Costs)	3	3	6	7
Interest Expense	(26)	(11)	(51)	(18)
Income Tax Benefit (Expense)	11	(19)	(113)	(102)
Net Income	(40)	41	256	275
Comprehensive Income (Loss)	(22)	$ 43	290	272
Net Cash Provided By (Used In) Operating Activities			1,150	869
Net Cash Provided By (Used In) Investing Activities			(714)	(1,095)
Net Cash Provided By (Used In) Financing Activities			(444)	$ 214
Current Assets	1,567		1,567			1,507
Property, Plant and Equipment, net	8,469		8,469			8,842
Investment in Subsidiaries	0		0			0
Noncurrent Assets	2,668		2,668			2,245
Total Assets	12,704		12,704			12,594
Current Liabilities	1,025		1,025			842
Noncurrent Liabilities	3,248		3,248			3,001
Long-Term Debt	2,431		2,431			2,791
Member's Equity	6,000		6,000			5,960
TOTAL LIABILITIES AND CAPITALIZATION	$ 12,704		$ 12,704			$ 12,594