Pension, OPEB and Savings Plans (Changes In The Benefit Obligation And The Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		$ 5,654
Fair Value of Assets at End of Year		5,413		$ 5,654
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Accrued Benefit Cost		(114)		(126)
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[1]	5,722		4,812
Service Cost		123		104		$ 116
Interest Cost		234		234		215
Actuarial (Gain) Loss		(289)	[2]	838
Gross Benefits Paid		(268)		(266)
Benefit Obligation at End of Year	[1]	5,522	[2]	5,722		4,812
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		5,293		5,116
Actual Return on Plan Assets		(11)		433
Employer Contributions		25		10
Gross Benefits Paid		(268)		(266)
Fair Value of Assets at End of Year		5,039		5,293		5,116
Funded Status (Plan Assets less Benefit Obligation)		(483)		(429)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Assets		14		21
Current Accrued Benefit Cost		(10)		(10)
Noncurrent Accrued Benefit Cost		(487)		(440)
Amounts Recognized		(483)		(429)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Prior Service Cost	[3]	(83)		(102)
Net Actuarial Loss	[3]	1,710		1,724
Total		(1,627)		(1,622)
Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[1]	1,638		1,414
Service Cost		22		18		21
Interest Cost		67		69		63
Actuarial (Gain) Loss		(45)	[2]	210
Gross Benefits Paid		(70)		(73)
Benefit Obligation at End of Year	[1]	1,612	[2]	1,638		1,414
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		361		319
Actual Return on Plan Assets		(1)		28
Employer Contributions		84		87
Gross Benefits Paid		(70)		(73)
Fair Value of Assets at End of Year		374		361		319
Funded Status (Plan Assets less Benefit Obligation)		(1,238)		(1,277)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Assets		0		0
Current Accrued Benefit Cost		(10)		0
Noncurrent Accrued Benefit Cost		(1,228)		(1,277)
Amounts Recognized		(1,238)		(1,277)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Prior Service Cost	[3]	(25)		(39)
Net Actuarial Loss	[3]	438		495
Total		(413)		(456)
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 Beginning of Year		69
Fair Value of Assets at End of Year		97		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		195	[4]	0
Service Cost		26		20
Interest Cost		9		7
Actuarial (Gain) Loss		(20)		42
Gross Benefits Paid		0		0
Plan Assumptions		1		126
Benefit Obligation at End of Year		211	[4]	195	[4]	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		69		0
Actual Return on Plan Assets		(2)		2
Employer Contributions		30		67
Gross Benefits Paid		0		0
Fair Value of Assets at End of Year		97		69		0
Funded Status (Plan Assets less Benefit Obligation)		(114)		(126)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Accrued Benefit Cost		(114)		(126)
Amounts Recognized	[5]	(114)		(126)
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		452	[4]	0
Service Cost		17		13
Interest Cost		21		17
Actuarial (Gain) Loss		(114)		107
Gross Benefits Paid		(1)		0
Plan Assumptions		0		315
Benefit Obligation at End of Year		375	[4]	452	[4]	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		0		0
Actual Return on Plan Assets		0		0
Employer Contributions		1		0
Gross Benefits Paid		(1)		0
Fair Value of Assets at End of Year		0		0		$ 0
Funded Status (Plan Assets less Benefit Obligation)		(375)		(452)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Accrued Benefit Cost		(375)		(452)
Amounts Recognized	[5]	$ (375)		$ (452)

[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 $658 million ($386 million, after-tax) and $702 million ($411 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2015 and 2014, respectively.

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

[5] 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.