Guarantees Of Debt (Schedule Of Financial Statements Of Guarantors) (Detail) - USD ($) $ in Millions	3 Months Ended														6 Months Ended		12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017		Mar. 31, 2017		Jun. 30, 2018		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Guarantees of Debt [Line Items]
Operating Revenues	$ 2,468		$ 2,394			$ 2,818		$ 2,107		$ 2,254	$ 2,142		$ 2,591		$ 2,016		$ 9,696	$ 9,094	$ 8,966
Operating Expenses																	7,398	7,665	7,368
Operating Income (Loss)	501	[1]	554			832	[1]	363	[1]	693	195	[1]	178	[1]	$ 411	[1]	2,298	1,429	1,598
Equity Earnings (Losses) of Subsidiaries																	15	14	11
Net Gains (Losses) on Trust Investments																	(143)	134	(6)
Other Income (Deductions)																	85	82	102
Non-Operating Pension and Other Postretirement Plan Credits (Costs)																	76	0	(22)
Interest Expense																	(476)	(391)	(385)
Income Tax Benefit (Expense)																	(417)	306	(411)
Net Income																	1,438	1,574	887
Net Cash Provided By (Used In) Operating Activities																	2,913	3,260	3,313
Net Cash Provided By (Used In) Investing Activities																	(3,916)	(4,256)	(4,248)
Net Cash Provided By (Used In) Financing Activities																	887	885	966
Current Assets	3,507							3,312									3,507	3,312
Property, Plant and Equipment, net	34,363							31,797									34,363	31,797
Noncurrent Assets	7,456							7,607									7,456	7,607
Total Assets	45,326							42,716									45,326	42,716	40,070
Current Liabilities	4,935							4,168									4,935	4,168
Noncurrent Liabilities	12,846							12,633									12,846	12,633
Total Long-Term Debt	13,168							12,068									13,168	12,068
Member's Equity	14,377							13,847									14,377	13,847	13,130	$ 13,067
TOTAL LIABILITIES AND CAPITALIZATION	45,326							42,716									45,326	42,716
Power [Member]
Guarantees of Debt [Line Items]
Operating Revenues	1,108		868	$ 767		1,403		827		846	918		1,269				4,146	3,860	3,861
Operating Expenses																	3,550	4,227	3,844
Operating Income (Loss)	113	[1]	$ 112	$ 42	[1]	$ 329	[1]	(84)	[1]	$ 211	$ (189)	[1]	$ (305)	[1]			596	(367)	17
Equity Earnings (Losses) of Subsidiaries																	15	14	11
Net Gains (Losses) on Trust Investments																	(140)	125	(6)
Other Income (Deductions)																	21	20	23
Non-Operating Pension and Other Postretirement Plan Credits (Costs)																	15	8	(4)
Interest Expense																	(76)	(50)	(84)
Income Tax Benefit (Expense)																	(66)	729	61
Net Income																	365	479	18
Net Cash Provided By (Used In) Operating Activities																	1,084	1,326	1,255
Net Cash Provided By (Used In) Investing Activities																	(1,051)	(1,232)	(1,147)
Net Cash Provided By (Used In) Financing Activities																	(43)	(73)	(109)
Current Assets	1,507							1,341									1,507	1,341
Property, Plant and Equipment, net	8,842							8,596									8,842	8,596
Noncurrent Assets	2,245							2,481									2,245	2,481
Total Assets	12,594							12,418									12,594	12,418
Current Liabilities	842							1,435									842	1,435
Noncurrent Liabilities	3,001							2,880									3,001	2,880
Total Long-Term Debt	2,791							2,136									2,791	2,136
Member's Equity	5,960							5,967									5,960	5,967	5,799	$ 6,002
TOTAL LIABILITIES AND CAPITALIZATION	12,594							12,418									12,594	12,418
Power Senior Notes [Member]
Guarantees of Debt [Line Items]
Operating Revenues																	4,146	3,860	3,861
Operating Expenses																	3,550	4,227	3,844
Operating Income (Loss)																	596	(367)	17
Equity Earnings (Losses) of Subsidiaries																	15	14	11
Net Gains (Losses) on Trust Investments																	(140)	125	(6)
Other Income (Deductions)																	21	20	23
Non-Operating Pension and Other Postretirement Plan Credits (Costs)																	15	8	(4)
Interest Expense																	(76)	(50)	(84)
Income Tax Benefit (Expense)																	(66)	729	61
Net Income																	365	479	18
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	393	518	47
Net Cash Provided By (Used In) Operating Activities																	1,084	1,326	1,255
Net Cash Provided By (Used In) Investing Activities																	(1,051)	(1,232)	(1,147)
Net Cash Provided By (Used In) Financing Activities																	(43)	(73)	(109)
Current Assets	1,507							1,341									1,507	1,341
Property, Plant and Equipment, net	8,842							8,596									8,842	8,596
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0							0									0	0
Noncurrent Assets	2,245							2,481									2,245	2,481
Total Assets	12,594							12,418									12,594	12,418
Current Liabilities	842							1,435									842	1,435
Noncurrent Liabilities	3,001							2,880									3,001	2,880
Total Long-Term Debt	2,791							2,136									2,791	2,136
Member's Equity	5,960							5,967									5,960	5,967
TOTAL LIABILITIES AND CAPITALIZATION	12,594							12,418									12,594	12,418
Power Senior Notes [Member] | Guarantor Subsidiaries [Member]
Guarantees of Debt [Line Items]
Operating Revenues																	4,078	3,821	3,809
Operating Expenses																	3,460	4,159	3,796
Operating Income (Loss)																	618	(338)	13
Equity Earnings (Losses) of Subsidiaries																	(28)	60	(3)
Net Gains (Losses) on Trust Investments																	(139)	122	(7)
Other Income (Deductions)																	166	91	60
Non-Operating Pension and Other Postretirement Plan Credits (Costs)																	13	8	(4)
Interest Expense																	(96)	(49)	(40)
Income Tax Benefit (Expense)																	(143)	588	(11)
Net Income																	391	482	8
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	379	529	50
Net Cash Provided By (Used In) Operating Activities																	1,007	1,185	1,442
Net Cash Provided By (Used In) Investing Activities																	(1,034)	(448)	(707)
Net Cash Provided By (Used In) Financing Activities																	27	(736)	(736)
Current Assets	1,479							1,500									1,479	1,500
Property, Plant and Equipment, net	4,971							5,778									4,971	5,778
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	1,107							404									1,107	404
Noncurrent Assets	2,109							2,349									2,109	2,349
Total Assets	9,666							10,031									9,666	10,031
Current Liabilities	2,971							3,586									2,971	3,586
Noncurrent Liabilities	1,996							1,966									1,996	1,966
Total Long-Term Debt	0							0									0	0
Member's Equity	4,699							4,479									4,699	4,479
TOTAL LIABILITIES AND CAPITALIZATION	9,666							10,031									9,666	10,031
Power Senior Notes [Member] | Non-Guarantor Subsidiaries [Member]
Guarantees of Debt [Line Items]
Operating Revenues																	224	174	173
Operating Expenses																	232	195	161
Operating Income (Loss)																	(8)	(21)	12
Equity Earnings (Losses) of Subsidiaries																	15	14	11
Net Gains (Losses) on Trust Investments																	0	0	0
Other Income (Deductions)																	0	2	0
Non-Operating Pension and Other Postretirement Plan Credits (Costs)																	2	0	0
Interest Expense																	(30)	(17)	(18)
Income Tax Benefit (Expense)																	8	167	20
Net Income																	(13)	145	25
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	(13)	145	25
Net Cash Provided By (Used In) Operating Activities																	42	238	323
Net Cash Provided By (Used In) Investing Activities																	(406)	(525)	(789)
Net Cash Provided By (Used In) Financing Activities																	354	307	466
Current Assets	304							200									304	200
Property, Plant and Equipment, net	3,822							2,764									3,822	2,764
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	0							0									0	0
Noncurrent Assets	101							110									101	110
Total Assets	4,227							3,074									4,227	3,074
Current Liabilities	2,027							1,846									2,027	1,846
Noncurrent Liabilities	730							459									730	459
Total Long-Term Debt	0							0									0	0
Member's Equity	1,470							769									1,470	769
TOTAL LIABILITIES AND CAPITALIZATION	4,227							3,074									4,227	3,074
Power Senior Notes [Member] | Power Parent [Member]
Guarantees of Debt [Line Items]
Operating Revenues																	0	0	0
Operating Expenses																	14	8	8
Operating Income (Loss)																	(14)	(8)	(8)
Equity Earnings (Losses) of Subsidiaries																	406	567	36
Net Gains (Losses) on Trust Investments																	(1)	3	1
Other Income (Deductions)																	135	71	52
Non-Operating Pension and Other Postretirement Plan Credits (Costs)																	0	0	0
Interest Expense																	(230)	(128)	(115)
Income Tax Benefit (Expense)																	69	(26)	52
Net Income																	365	479	18
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	393	518	47
Net Cash Provided By (Used In) Operating Activities																	(74)	(42)	97
Net Cash Provided By (Used In) Investing Activities																	(402)	506	60
Net Cash Provided By (Used In) Financing Activities																	476	(464)	(157)
Current Assets	4,317							4,327									4,317	4,327
Property, Plant and Equipment, net	49							54									49	54
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	5,062							4,844									5,062	4,844
Noncurrent Assets	273							100									273	100
Total Assets	9,701							9,325									9,701	9,325
Current Liabilities	437							689									437	689
Noncurrent Liabilities	513							533									513	533
Total Long-Term Debt	2,791							2,136									2,791	2,136
Member's Equity	5,960							5,967									5,960	5,967
TOTAL LIABILITIES AND CAPITALIZATION	9,701							9,325									9,701	9,325
Consolidation, Eliminations [Member] | Power Senior Notes [Member]
Guarantees of Debt [Line Items]
Operating Revenues																	(156)	(135)	(121)
Operating Expenses																	(156)	(135)	(121)
Operating Income (Loss)																	0	0	0
Equity Earnings (Losses) of Subsidiaries																	(378)	(627)	(33)
Net Gains (Losses) on Trust Investments																	0	0	0
Other Income (Deductions)																	(280)	(144)	(89)
Non-Operating Pension and Other Postretirement Plan Credits (Costs)																	0	0	0
Interest Expense																	280	144	89
Income Tax Benefit (Expense)																	0	0	0
Net Income																	(378)	(627)	(33)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent																	(366)	(674)	(75)
Net Cash Provided By (Used In) Operating Activities																	109	(55)	(607)
Net Cash Provided By (Used In) Investing Activities																	791	(765)	289
Net Cash Provided By (Used In) Financing Activities																	(900)	820	$ 318
Current Assets	(4,593)							(4,686)									(4,593)	(4,686)
Property, Plant and Equipment, net	0							0									0	0
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(6,169)							(5,248)									(6,169)	(5,248)
Noncurrent Assets	(238)							(78)									(238)	(78)
Total Assets	(11,000)							(10,012)									(11,000)	(10,012)
Current Liabilities	(4,593)							(4,686)									(4,593)	(4,686)
Noncurrent Liabilities	(238)							(78)									(238)	(78)
Total Long-Term Debt	0							0									0	0
Member's Equity	(6,169)							(5,248)									(6,169)	(5,248)
TOTAL LIABILITIES AND CAPITALIZATION	$ (11,000)							$ (10,012)									$ (11,000)	$ (10,012)

[1] The increases in Operating Income at PSEG consolidated and Power in the first and second quarters of 2018 as compared to the same quarters in 2017 were primarily due to higher costs in 2017 related to closing the coal/gas Hudson and Mercer units, which were fully depreciated as of June 1, 2017. The increases in Operating Income at PSEG consolidated and Power in the fourth quarter 2018 as compared to the same quarter in 2017 were primarily due to lower MTM losses and a gain on the sale of the Hudson and Mercer units.The decreases in Net Income at PSEG consolidated and Power in the fourth quarter 2018 as compared to the same quarter in 2017 also reflected the impact of the one-time benefit recorded in December 2017 as a result of the remeasurement of deferred tax balances and the inclusion in 2018 of net unrealized losses on equity investments in the NDT Fund in accordance with new accounting guidance.