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, 2016		Dec. 31, 2015		Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	[1]	$ 5,405
Fair Value of Assets at End of Year	[1]	5,599		$ 5,405
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Accrued Benefit Cost		(128)		(114)
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[2]	5,522		5,722
Service Cost		109		123		$ 104
Interest Cost		202		234		234
Actuarial (Gain) Loss		219	[3]	(289)
Gross Benefits Paid		(282)		(268)
Plan Assumptions		2		0
Benefit Obligation at End of Year	[2]	5,772	[3]	5,522		5,722
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		5,039		5,293
Actual Return on Plan Assets		403		(11)
Employer Contributions		33		25
Gross Benefits Paid		(282)		(268)
Fair Value of Assets at End of Year		5,193		5,039		5,293
Funded Status (Plan Assets less Benefit Obligation)		(579)		(483)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Assets		0		14
Current Accrued Benefit Cost		(11)		(10)
Noncurrent Accrued Benefit Cost		(568)		(487)
Amounts Recognized		(579)		(483)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Prior Service Cost		(63)		(83)
Net Actuarial Loss		1,763		1,710
Total		(1,700)		(1,627)
Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[2]	1,612		1,638
Service Cost		17		22		18
Interest Cost		59		67		69
Actuarial (Gain) Loss		127	[3]	(45)
Gross Benefits Paid		(57)		(70)
Plan Assumptions		(4)		0
Benefit Obligation at End of Year	[2]	1,754	[3]	1,612		1,638
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		374		361
Actual Return on Plan Assets		32		(1)
Employer Contributions		71		84
Gross Benefits Paid		(57)		(70)
Fair Value of Assets at End of Year		420		374		361
Funded Status (Plan Assets less Benefit Obligation)		(1,334)		(1,238)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Assets		0		0
Current Accrued Benefit Cost		(10)		(10)
Noncurrent Accrued Benefit Cost		(1,324)		(1,228)
Amounts Recognized		(1,334)		(1,238)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Prior Service Cost		(14)		(25)
Net Actuarial Loss		523		438
Total		(509)		(413)
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		97
Fair Value of Assets at End of Year		134		97
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		211	[4]	195
Service Cost		24		26
Interest Cost		9		9
Actuarial (Gain) Loss		14		(20)
Gross Benefits Paid		(1)		0
Plan Assumptions		5		1
Benefit Obligation at End of Year		262	[4]	211	[4]	195
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		97		69
Actual Return on Plan Assets		10		(2)
Employer Contributions		28		30
Gross Benefits Paid		(1)		0
Fair Value of Assets at End of Year		134		97		69
Funded Status (Plan Assets less Benefit Obligation)		(128)		(114)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Accrued Benefit Cost		(128)		(114)
Amounts Recognized	[5]	(128)		(114)
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		375	[4]	452
Service Cost		12		17
Interest Cost		17		21
Actuarial (Gain) Loss		50		(114)
Gross Benefits Paid		(2)		(1)
Plan Assumptions		0		0
Benefit Obligation at End of Year		452	[4]	375	[4]	452
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		2		1
Gross Benefits Paid		(2)		(1)
Fair Value of Assets at End of Year		0		0		$ 0
Funded Status (Plan Assets less Benefit Obligation)		(452)		(375)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent Accrued Benefit Cost		(452)		(375)
Amounts Recognized	[5]	$ (452)		$ (375)

[1] Excludes net receivable of $14 million and $8 million at December 31, 2016 and 2015, respectively, which consists of interest and dividend, receivables and payables related to pending securities sales and purchases.

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

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

[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 Sheets.