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, 2017		Dec. 31, 2016		Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	[1]	$ 5,599
Fair Value of Assets at End of Year	[1]	6,310		$ 5,599
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(129)		(128)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Regulatory Assets		1,485		1,396
Deferred Costs and Other Assets		133		134
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[3]	5,772	[2]			$ 5,522
Service Cost		114		109		123
Interest Cost		204		202		234
Actuarial (Gain) Loss		564		219
Defined Benefit Plan, Benefit Obligation, Benefits Paid		295		282
Gross Benefits Paid		(295)		(282)
Plan Assumptions		0		2
Benefit Obligation at End of Year	[3]	6,359		5,772	[2]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		5,193				5,039
Actual Return on Plan Assets		903		403
Employer Contributions		11		33
Fair Value of Assets at End of Year		5,812		5,193
Funded Status (Plan Assets less Benefit Obligation)		(547)		(579)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current Accrued Benefit Cost		(10)		(11)
Accrued Benefit Cost		(537)		(568)
Amounts Recognized		(547)		(579)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior Service Cost		(46)		(63)
Net Actuarial Loss		1,721		1,763
Total	[2]	(1,675)		(1,700)
Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[3]	1,754	[2]			1,612
Service Cost		17		17		22
Interest Cost		63		59		67
Actuarial (Gain) Loss		199		127
Defined Benefit Plan, Benefit Obligation, Benefits Paid		57		57
Gross Benefits Paid		(57)		(57)
Plan Assumptions		0		(4)
Benefit Obligation at End of Year	[3]	1,976		1,754	[2]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		420				374
Actual Return on Plan Assets		77		32
Employer Contributions		71		71
Fair Value of Assets at End of Year		511		420
Funded Status (Plan Assets less Benefit Obligation)		(1,465)		(1,334)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current Accrued Benefit Cost		(10)		(10)
Accrued Benefit Cost		(1,455)		(1,324)
Amounts Recognized		(1,465)		(1,334)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior Service Cost		(3)		(14)
Net Actuarial Loss		629		523
Total	[2]	(626)		(509)
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		134
Fair Value of Assets at End of Year		191		134
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		262	[4]			211
Service Cost		27		24
Interest Cost		11		9
Actuarial (Gain) Loss		22		14
Defined Benefit Plan, Benefit Obligation, Benefits Paid		2		1
Gross Benefits Paid		(2)		(1)
Plan Assumptions		0		5
Benefit Obligation at End of Year	[4]	320		262
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		134				97
Actual Return on Plan Assets		24		10
Employer Contributions		35		28
Fair Value of Assets at End of Year		191		134
Funded Status (Plan Assets less Benefit Obligation)		(129)		(128)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(129)		(128)
Amounts Recognized	[5]	(129)		(128)
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]			375
Service Cost		15		12
Interest Cost		19		17
Actuarial (Gain) Loss		60		50
Defined Benefit Plan, Benefit Obligation, Benefits Paid		4		2
Gross Benefits Paid		(4)		(2)
Plan Assumptions		0		0
Benefit Obligation at End of Year	[4]	542		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		4		2
Fair Value of Assets at End of Year		0		0
Funded Status (Plan Assets less Benefit Obligation)		(542)		(452)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(542)		(452)
Amounts Recognized	[5]	$ (542)		$ (452)

[1] Excludes net receivable of $13 million and $14 million at December 31, 2017 and 2016, respectively, which consists of interest, dividends and receivables and payables related to pending securities sales and purchases.

[2] Includes $683 million ($406 million, after-tax) and $679 million ($398 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2017 and 2016, respectively. Also includes Regulatory Assets of $1,485 million and Deferred Assets of $133 million as of December 31, 2017 and Regulatory Assets of $1,396 million and Deferred Assets of $134 million as of December 31, 2016.

[3] Represents projected benefit obligation for pension benefits and the accumulated postretirement benefit obligation for other benefits. The vested benefit obligation is the actuarial present value of the vested benefits to which the employee is currently entitled but based on the employee’s expected date of separation of retirement.

[4] Represents projected benefit obligation for pension benefits and the accumulated postretirement benefit obligation for other benefits. The vested benefit obligation is the actuarial present value of the vested benefits to which the employee is currently entitled but based on the employee’s expected date of separation of retirement.

[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.