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, 2019		Dec. 31, 2018		Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	[1]	$ 5,595
Fair Value of Assets at End of Year	[1]	6,449		$ 5,595
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(171)		(109)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax		695		619
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax		499		360
Regulatory Assets		1,284		1,090
Deferred Costs and Other Assets		137		127
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[2]	5,921		6,359
Service Cost		123		130		$ 114
Interest Cost		218		208		204
Actuarial (Gain) Loss		955		(460)
Gross Benefits Paid		(325)		(316)
Plan Assumptions		0		0
Benefit Obligation at End of Year	[2]	6,892		5,921		6,359
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		5,120		5,812
Actual Return on Plan Assets		1,122		(388)
Employer Contributions		12		12
Gross Benefits Paid		(325)		(316)
Fair Value of Assets at End of Year		5,929		5,120		5,812
Funded Status (Plan Assets less Benefit Obligation)		(963)		(801)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current Accrued Benefit Cost		(11)		(10)
Accrued Benefit Cost		(952)		(791)
Amounts Recognized		(963)		(801)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior Service Cost		(10)		(28)
Net Actuarial Loss		2,150		2,005
Total	[3]	(2,140)		(1,977)
Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[2]	1,203		1,976
Service Cost		10		18		17
Interest Cost		45		66		63
Actuarial (Gain) Loss		109		(222)
Gross Benefits Paid		(82)		(76)
Plan Assumptions		0		(559)
Benefit Obligation at End of Year	[2]	1,285		1,203		1,976
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		488		511
Actual Return on Plan Assets		107		(36)
Employer Contributions		27		89
Gross Benefits Paid		(82)		(76)
Fair Value of Assets at End of Year		540		488		511
Funded Status (Plan Assets less Benefit Obligation)		(745)		(715)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current Accrued Benefit Cost		(11)		(11)
Accrued Benefit Cost		(734)		(704)
Amounts Recognized		(745)		(715)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior Service Cost		(433)		(561)
Net Actuarial Loss		409		420
Total	[3]	24		141
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		212
Fair Value of Assets at End of Year		282		212
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		321	[4]	320
Service Cost		26		30
Interest Cost		14		12
Actuarial (Gain) Loss		96		(38)
Gross Benefits Paid		(4)		(3)
Plan Assumptions		0		0
Benefit Obligation at End of Year		453	[4]	321	[4]	320
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		212		191
Actual Return on Plan Assets		46		(16)
Employer Contributions		28		40
Gross Benefits Paid		(4)		(3)
Fair Value of Assets at End of Year		282		212		191
Funded Status (Plan Assets less Benefit Obligation)		(171)		(109)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(171)		(109)
Amounts Recognized	[5]	(171)		(109)
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		501	[4]	542
Service Cost		16		18
Interest Cost		22		20
Actuarial (Gain) Loss		96		(73)
Gross Benefits Paid		(6)		(6)
Plan Assumptions		(3)		0
Benefit Obligation at End of Year		626	[4]	501	[4]	542
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		6
Gross Benefits Paid		(6)		(6)
Fair Value of Assets at End of Year		0		0		$ 0
Funded Status (Plan Assets less Benefit Obligation)		(626)		(501)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(626)		(501)
Amounts Recognized	[5]	$ (626)		$ (501)

[1] Excludes net receivables of $15 million and $14 million as of December 31, 2019 and 2018, 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 or retirement.

[3] Includes $695 million ($499 million, after-tax) and $619 million ($360 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2019 and 2018, respectively. Also includes Regulatory Assets of $1,284 million and Deferred Assets of $137 million as of December 31, 2019 and Regulatory Assets of $1,090 million and Deferred Assets of $127 million as of December 31, 2018.

[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 or 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.