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, 2018		Dec. 31, 2017		Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	[1]	$ 6,310
Fair Value of Assets at End of Year	[1]	5,595		$ 6,310
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(109)		(129)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Regulatory Assets		1,090		1,485
Deferred Costs and Other Assets		127		133
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[2]	6,359		5,772
Service Cost		130		114		$ 109
Interest Cost		208		204		202
Actuarial (Gain) Loss		(460)		564
Gross Benefits Paid		(316)		(295)
Plan Assumptions		0		0
Benefit Obligation at End of Year	[2]	5,921		6,359		5,772
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		5,812		5,193
Actual Return on Plan Assets		(388)		903
Employer Contributions		12		11
Gross Benefits Paid		(316)		(295)
Fair Value of Assets at End of Year		5,120		5,812		5,193
Funded Status (Plan Assets less Benefit Obligation)		(801)		(547)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current Accrued Benefit Cost		(10)		(10)
Accrued Benefit Cost		(791)		(537)
Amounts Recognized		(801)		(547)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior Service Cost		(28)		(46)
Net Actuarial Loss		2,005		1,721
Total	[3]	(1,977)		(1,675)
Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[2]	1,976		1,754
Service Cost		18		17		17
Interest Cost		66		63		59
Actuarial (Gain) Loss		(222)		199
Gross Benefits Paid		(76)		(57)
Plan Assumptions		(559)		0
Benefit Obligation at End of Year	[2]	1,203		1,976		1,754
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		511		420
Actual Return on Plan Assets		(36)		77
Employer Contributions		89		71
Gross Benefits Paid		(76)		(57)
Fair Value of Assets at End of Year		488		511		420
Funded Status (Plan Assets less Benefit Obligation)		(715)		(1,465)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current Accrued Benefit Cost		(11)		(10)
Accrued Benefit Cost		(704)		(1,455)
Amounts Recognized		(715)		(1,465)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior Service Cost		(561)		(3)
Net Actuarial Loss		420		629
Total	[3]	141		(626)
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		191
Fair Value of Assets at End of Year		212		191
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		320	[4]	262
Service Cost		30		27
Interest Cost		12		11
Actuarial (Gain) Loss		(38)		22
Gross Benefits Paid		(3)		(2)
Plan Assumptions		0		0
Benefit Obligation at End of Year		321	[4]	320	[4]	262
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		191		134
Actual Return on Plan Assets		(16)		24
Employer Contributions		40		35
Gross Benefits Paid		(3)		(2)
Fair Value of Assets at End of Year		212		191		134
Funded Status (Plan Assets less Benefit Obligation)		(109)		(129)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(109)		(129)
Amounts Recognized	[5]	(109)		(129)
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		542	[4]	452
Service Cost		18		15
Interest Cost		20		19
Actuarial (Gain) Loss		(73)		60
Gross Benefits Paid		(6)		(4)
Plan Assumptions		0		0
Benefit Obligation at End of Year		501	[4]	542	[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		6		4
Gross Benefits Paid		(6)		(4)
Fair Value of Assets at End of Year		0		0		$ 0
Funded Status (Plan Assets less Benefit Obligation)		(501)		(542)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(501)		(542)
Amounts Recognized	[5]	$ (501)		$ (542)

[1] Excludes net receivables of $14 million and $13 million at December 31, 2018 and 2017, respectively, which consist of interest, dividends and 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. 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.

[3] Includes $619 million ($360 million, after-tax) and $683 million ($406 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2018 and 2017, respectively. Also includes Regulatory Assets of $1,090 million and Deferred Assets of $127 million as of December 31, 2018 and Regulatory Assets of $1,485 million and Deferred Assets of $133 million as of December 31, 2017.

[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.