| Document and Entity Information | Apr. 21, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | PUBLIC SERVICE ENTERPRISE GROUP INC |
| Amendment Flag | false |
| Entity Central Index Key | 0000788784 |
| Document Type | 8-K |
| Document Period End Date | Apr. 21, 2020 |
| Entity Incorporation State Country Code | NJ |
| Entity File Number | 001-09120 |
| Entity Tax Identification Number | 22-2625848 |
| Entity Address, Address Line One | 80 Park Plaza |
| Entity Address, City or Town | Newark |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07102 |
| City Area Code | 973 |
| Local Phone Number | 430-7000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock without par value |
| Trading Symbol | PEG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
