Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2018
Apr. 17, 2018
Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Trading Symbol PEG  
Entity Registrant Name PUBLIC SERVICE ENTERPRISE GROUP INC  
Entity Central Index Key 0000788784  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   505,217,435
PSE And G [Member]    
Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Entity Registrant Name PUBLIC SERVICE ELECTRIC & GAS CO  
Entity Central Index Key 0000081033  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   132,450,344
Power [Member]    
Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Entity Registrant Name PSEG POWER LLC  
Entity Central Index Key 0001158659  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer