Pension, OPEB and Savings Plans (Narrative) (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2016 USD ($) plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent		$ 128	$ 114
Number of PSEG's defined contribution plans | plan		2
Historical annualized rate of return		9.30%
Defined benefit plan funded status of plan percentage		90.00%
Rabbi trust assets used to fund nonqualified pension plans		$ 217
Defined benefit plans, projected benefit and accumulated benefit obligations		5,600	5,400
OPEB Plan estimated contribution in next fiscal year		$ 14
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		$ 41	39	$ 36
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		398	386
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax		679	658
Defined Benefit Plan, Net Periodic Benefit Cost		56	74	$ (23)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent		$ 568	$ 487
Expected long-term rate of return on plan assets		8.00%	8.00%	8.00%
Interest in Master Trust assets percentage		93.00%
Other Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation		$ 161
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost		71	$ 87	$ 70
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent		$ 1,324	$ 1,228
Expected long-term rate of return on plan assets		8.00%	8.00%	8.00%
Interest in Master Trust assets percentage			7.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets		70.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets		30.00%
Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Employer Matching Contributions		$ 12	$ 12	$ 11
Power [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost		16	21	(7)
Power [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost		$ 23	27	20
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 Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 35
Maximum annual 401(k) contribution per employee, percent		8.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		50.00%
Employer matching contribution, percent		50.00%
Total Employer Matching Contributions		$ 5	4	3
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		28	30	$ 67
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent		$ 128	114
Expected long-term rate of return on plan assets		7.70%
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		$ 2
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent		$ 452	$ 375
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage of assets		70.00%
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		30.00%
Change in Accounting Method Accounted for as Change in Estimate [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost		$ 34
Change in Accounting Method Accounted for as Change in Estimate [Member] | Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost		$ 13
Subsequent Event [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	7.60%