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Pension, OPEB and Savings Plans (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
plan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent $ 114 $ 126  
Number of PSEG's defined contribution plans | plan 2    
Historical annualized rate of return 9.30%    
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year $ 21    
Defined benefit plan funded status of plan percentage 91.00%    
Rabbi trust assets used to fund nonqualified pension plans $ 213    
Defined benefit plans, projected benefit and accumulated benefit obligations 5,400 5,500  
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%    
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Impact of Mortality Table Change in Actuarial (Gain) Loss $ 314    
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 386 411  
Accumulated Other Comprehensive Income (Loss), Defined Benefit Pension and Other Postretirement Plans, Before Tax 658 702  
Defined Benefit Plan, Net Periodic Benefit Cost 74 (23) $ 152
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent $ 487 $ 440  
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 $ 159    
Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Impact of Mortality Table Change in Actuarial (Gain) Loss 79    
Defined Benefit Plan, Net Periodic Benefit Cost 87 $ 70 $ 91
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent $ 1,228 $ 1,277  
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] | Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost $ 21 $ (7) $ 43
Power [Member] | Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost $ 27 20 $ 23
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]      
Defined Benefit Plan, Net Periodic Benefit Cost $ 30 67  
Number of PSEG's defined contribution plans | plan 2    
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year $ 28    
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%    
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent $ 114 126  
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]      
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent $ 375 $ 452  
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%