Pension, OPEB and Savings Plans (Changes In The Benefit Obligation And The Fair Value Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Year	$ 5,654		$ 5,435
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Accrued Benefit Cost	(126)		0
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	4,812	[1]	5,235	[1]
Service Cost	104		116		101
Interest Cost	234		215		223
Actuarial (Gain) Loss	838	[2]	(501)
Gross Benefits Paid	(266)		(253)
Benefit Obligation at End of Year	5,722	[1],[2]	4,812	[1]	5,235	[1]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	5,116		4,357
Actual Return on Plan Assets	433		857
Employer Contributions	10		155
Gross Benefits Paid	(266)		(253)
Fair Value of Assets at End of Year	5,293		5,116		4,357
Funded Status (Plan Assets less Benefit Obligation)	(429)		304
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Assets	21		434
Current Accrued Benefit Cost	(10)		(9)
Noncurrent Accrued Benefit Cost	(440)		(121)
Amounts Recognized	(429)		304
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Prior Service Cost	(102)	[3]	(120)	[3]
Net Actuarial Loss	1,724	[3]	977	[3]
Total	(1,622)		(857)
Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	1,414	[1]	1,538	[1]
Service Cost	18		21		17
Interest Cost	69		63		65
Actuarial (Gain) Loss	210	[2]	(144)
Gross Benefits Paid	(73)		(64)
Benefit Obligation at End of Year	1,638	[1],[2]	1,414	[1]	1,538	[1]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	319		253
Actual Return on Plan Assets	28		52
Employer Contributions	87		78
Gross Benefits Paid	(73)		(64)
Fair Value of Assets at End of Year	361		319		253
Funded Status (Plan Assets less Benefit Obligation)	(1,277)		(1,095)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Assets	0		0
Current Accrued Benefit Cost	0		0
Noncurrent Accrued Benefit Cost	(1,277)		(1,095)
Amounts Recognized	(1,277)		(1,095)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Prior Service Cost	(39)	[3]	(53)	[3]
Net Actuarial Loss	495	[3]	310	[3]
Total	(456)		(257)
Long Island Electric Utility Servco LLC Pension and OPEB [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at End of Year	69
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	0
Service Cost	20
Interest Cost	7
Actuarial (Gain) Loss	42
Plan Assumptions	126
Benefit Obligation at End of Year	195	[1]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	0
Actual Return on Plan Assets	2
Employer Contributions	67
Fair Value of Assets at End of Year	69
Funded Status (Plan Assets less Benefit Obligation)	(126)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Accrued Benefit Cost	(126)
Noncurrent Accrued Benefit Cost	0
Amounts Recognized	(126)	[4]
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	0
Service Cost	13
Interest Cost	17
Actuarial (Gain) Loss	107
Plan Assumptions	315
Benefit Obligation at End of Year	452	[1]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	0
Actual Return on Plan Assets	0
Employer Contributions	0
Fair Value of Assets at End of Year	0
Funded Status (Plan Assets less Benefit Obligation)	(452)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Current Accrued Benefit Cost	0
Noncurrent Accrued Benefit Cost	(452)
Amounts Recognized	$ (452)	[4]

[1] Represents projected benefit obligation for pension benefits and the accumulated postretirement benefit obligation for other benefits.

[2] In October 2014, the Society of Actuaries’ Retirement Plans Experience Committee issued its final report on mortality tables (RP-2014 Mortality Tables Report). As of December 31, 2014, PSEG updated its mortality assumptions based on the information contained in this report. The impact of this change is reflected in Actuarial (Gain) Loss in 2014 and added $314 million and $79 million to the Benefit Obligations for Pension and OPEB, respectively, since December 31, 2013.

[3] Includes $702 million ($411 million, after-tax) and $408 million ($238 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2014 and 2013, respectively.

[4] Amounts equal to the accrued pension and OPEB costs of Servco are offset in Long-Term Receivable of VIE on PSEG's Consolidated Balance Sheet.