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, 2020		Dec. 31, 2019		Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year	[1]	$ 6,449
Fair Value of Assets at End of Year	[1]	6,921		$ 6,449
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(226)		(171)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax		760		695
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax		545		499
Regulatory Assets		1,489		1,284
Deferred Costs and Other Assets		159		137
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[2]	6,892		5,921
Service Cost		141		123		$ 130
Interest Cost		192		218		208
Actuarial (Gain) Loss	[3]	615		955
Gross Benefits Paid		(333)		(325)
Plan Assumptions		0		0
Benefit Obligation at End of Year	[2]	7,507		6,892		5,921
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		5,929		5,120
Actual Return on Plan Assets		761		1,122
Employer Contributions		11		12
Gross Benefits Paid		(333)		(325)
Fair Value of Assets at End of Year		6,368		5,929		5,120
Funded Status (Plan Assets less Benefit Obligation)		(1,139)		(963)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current Accrued Benefit Cost		(11)		(11)
Accrued Benefit Cost		(1,128)		(952)
Amounts Recognized		(1,139)		(963)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior Service Cost		0		(10)
Net Actuarial Loss		2,354		2,150
Total	[4]	(2,354)		(2,140)
Other Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	[2]	1,285		1,203
Service Cost		9		10		18
Interest Cost		34		45		66
Actuarial (Gain) Loss	[3]	32		109
Gross Benefits Paid		(50)		(82)
Plan Assumptions		(4)		0
Benefit Obligation at End of Year	[2]	1,306		1,285		1,203
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		540		488
Actual Return on Plan Assets		70		107
Employer Contributions		4		27
Gross Benefits Paid		(50)		(82)
Fair Value of Assets at End of Year		564		540		488
Funded Status (Plan Assets less Benefit Obligation)		(742)		(745)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Current Accrued Benefit Cost		(12)		(11)
Accrued Benefit Cost		(730)		(734)
Amounts Recognized		(742)		(745)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Prior Service Cost		(310)		(433)
Net Actuarial Loss		364		409
Total	[4]	(54)		24
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		282
Fair Value of Assets at End of Year		343		282
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		453	[5]	321
Service Cost		33		26
Interest Cost		14		14
Actuarial (Gain) Loss		74		96
Gross Benefits Paid		(5)		(4)
Plan Assumptions		0		0
Benefit Obligation at End of Year		569	[5]	453	[5]	321
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Assets at Beginning of Year		282		212
Actual Return on Plan Assets		36		46
Employer Contributions		30		28
Gross Benefits Paid		(5)		(4)
Fair Value of Assets at End of Year		343		282		212
Funded Status (Plan Assets less Benefit Obligation)		(226)		(171)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(226)		(171)
Amounts Recognized	[6]	(226)		(171)
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		626	[5]	501
Service Cost		20		16
Interest Cost		20		22
Actuarial (Gain) Loss		42		96
Gross Benefits Paid		(9)		(6)
Plan Assumptions		0		(3)
Benefit Obligation at End of Year		699	[5]	626	[5]	501
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		9		6
Gross Benefits Paid		(9)		(6)
Fair Value of Assets at End of Year		0		0		$ 0
Funded Status (Plan Assets less Benefit Obligation)		(699)		(626)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued Benefit Cost		(699)		(626)
Amounts Recognized	[6]	$ (699)		$ (626)

[1] Excludes net receivables of $10 million and $15 million as of December 31, 2020 and 2019, respectively, which consist of interest, dividends and receivables and payables related to pending securities sales and purchases. In addition, the table excludes cash and foreign currency of $1 million and $5 million as of December 31, 2020 and 2019, respectively.

[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] For pension benefits, the net actuarial loss was primarily due to a decrease in the discount rate. For OPEB, the net actuarial loss was primarily due to a decrease in the discount rate, partially offset by actuarial gains driven by lower than expected claims experience.

[4] Includes $760 million ($545 million, after-tax) and $695 million ($499 million, after-tax) in Accumulated Other Comprehensive Loss related to Pension and OPEB as of December 31, 2020 and 2019, respectively. Also includes Regulatory Assets of $1,489 million and Deferred Assets of $159 million as of December 31, 2020 and Regulatory Assets of $1,284 million and Deferred Assets of $137 million as of December 31, 2019.

[5] 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.(B)For pension benefits, the net actuarial loss was primarily due to a decrease in the discount rate. For OPEB, the net actuarial loss in 2020 was primarily due to a decrease in the discount rate, partially offset by actuarial gains driven by lower than expected participation experience. The OPEB net actuarial loss in 2019 was primarily due to a decrease in the discount rate.

[6] 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.