Pension, OPEB and Savings Plans (Narrative) (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2021	Dec. 31, 2020 USD ($) plan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jul. 01, 2019 USD ($)	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Number of PSEG's defined contribution plans | plan			2
Defined benefit plan funded status of plan percentage			85.00%
Rabbi trust assets used to fund nonqualified pension plans			$ 266
Defined benefit plans, projected benefit and accumulated benefit obligations			$ 7,300	$ 6,700
Maximum annual 401(k) contribution per employee, percent			50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50.00%
Total Employer Matching Contributions			$ 43	40	$ 41
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax			545	499
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax			760	695
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			$ (28)	$ 11	$ (36)
Discount Rate	4.41%		2.61%	3.30%		3.65%	4.41%
Expected long-term rate of return on plan assets	7.80%		7.70%	7.80%	7.80%
Defined benefit plans, projected benefit and accumulated benefit obligations						$ 6,400
Interest in Master Trust assets percentage			92.00%
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment			$ 0	$ 0
Other Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation			182
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			$ (77)	$ (59)	$ 106
Discount Rate			2.46%	3.20%			4.31%
Expected long-term rate of return on plan assets			7.70%	7.79%	7.80%
Interest in Master Trust assets percentage				8.00%
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment			$ 4	$ 0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets			59.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets			23.00%
Thrift Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent			8.00%
Savings Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent			7.00%
Long Island Electric Utility Servco LLC Pension and OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of PSEG's defined contribution plans | plan			2
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year			$ 37
Maximum annual 401(k) contribution per employee, percent			50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50.00%
Employer matching contribution, percent			8.00%
Total Employer Matching Contributions			$ 9	8	$ 7
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			$ 30	$ 28	$ 40
Discount Rate			2.98%	3.52%	4.60%
Expected long-term rate of return on plan assets			7.60%
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment			$ 0	$ 0
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)			$ 9	$ 6	$ 6
Discount Rate			3.08%	3.60%	4.67%
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment			$ 0	$ 3
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets			60.00%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets			25.00%
Subsequent Event [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		7.70%