Income Taxes (Reconciliation Of Reported Income Tax Expense) (Details) - USD ($) $ in Millions	3 Months Ended										12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Net Income	$ 956	[1]	$ 395	$ 109	$ 114	$ (98)	[1]	$ 327	$ 187	$ 471
Net Income											$ 1,574	$ 887	$ 1,679
Federal											86	(74)	243
State											(31)	61	85
Total Current											55	(13)	328
Federal											(482)	311	540
State											92	28	104
Total Deferred											(390)	339	644
Investment tax credit											29	85	29
Total Income Tax											(306)	411	1,001
Pre-Tax Income											1,268	1,298	2,680
Tax Computed at Statutory Rate @ 35%											444	454	938
State Income Taxes (net of federal income tax)											36	56	129
Uncertain Tax Positions											(3)	(31)	7
Manufacturing Deduction											(13)	(17)	(10)
Nuclear Decommissioning Trust											19	3	7
Plant-Related Items											(23)	(20)	(20)
Tax Credits											(22)	(25)	(13)
Audit Settlement											6	0	0
Nuclear Decommissiong Tax Carryback											0	0	(33)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount											(755)	0	0
Other											5	(9)	(4)
Sub-Total											(750)	(43)	63
Income Tax Provision											$ (306)	$ 411	$ 1,001
Effective income tax rate											(24.10%)	31.70%	37.40%
PSE&G [Member]
Income Taxes [Line Items]
Net Income	220		246	208	299	193		255	179	262
Net Income											$ 973	$ 889	$ 787
Federal											(52)	(153)	32
State											(1)	10	52
Total Current											(53)	(143)	84
Federal											492	551	325
State											129	102	52
Total Deferred											621	653	377
Investment tax credit											(5)	5	9
Total Income Tax											563	515	470
Pre-Tax Income											1,536	1,404	1,257
Tax Computed at Statutory Rate @ 35%											538	491	440
State Income Taxes (net of federal income tax)											83	72	67
Uncertain Tax Positions											(9)	(18)	(14)
Plant-Related Items											(23)	(20)	(20)
Tax Credits											(9)	(7)	(6)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount											(10)	0	0
Other											(7)	(3)	3
Sub-Total											25	24	30
Income Tax Provision											$ 563	$ 515	$ 470
Effective income tax rate											36.70%	36.70%	37.40%
Power [Member]
Income Taxes [Line Items]
Net Income	$ 610	[1]	$ 136	$ (97)	$ (170)	$ (302)	[1]	$ 139	$ (11)	$ 192
Net Income											$ 479	$ 18	$ 856
Federal											95	107	220
State											(17)	40	30
Total Current											78	147	250
Federal											(804)	(222)	189
State											(37)	(68)	52
Total Deferred											(841)	(290)	241
Investment tax credit											34	82	20
Total Income Tax											(729)	(61)	511
Pre-Tax Income											(250)	(43)	1,367
Tax Computed at Statutory Rate @ 35%											(88)	(15)	478
State Income Taxes (net of federal income tax)											(36)	(18)	59
Uncertain Tax Positions											7	9	22
Manufacturing Deduction											(13)	(17)	(10)
Nuclear Decommissioning Trust											19	3	7
Tax Credits											(12)	(18)	(7)
Audit Settlement											1	0	0
Nuclear Decommissiong Tax Carryback											0	0	(33)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount											(610)	0	0
Other											3	(5)	(5)
Sub-Total											(641)	(46)	33
Income Tax Provision											$ (729)	$ (61)	$ 511
Effective income tax rate											291.60%	141.90%	37.40%

[1] The increases in Operating Income at PSEG consolidated and Power in the fourth quarter 2017 as compared to the same quarter in 2016 were primarily due to higher costs in 2016 related to closing the coal/gas Hudson and Mercer units, which were fully depreciated as of June 1, 2017. The increases in Net Income at PSEG consolidated and Power in the fourth quarter 2017 as compared to the same quarter in 2016 also includes the impact of the remeasurement of deferred tax balances resulting from the enactment of new tax legislation in December 2017. See Note 20. Income Taxes for additional information.