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COVER PAGE - shares
9 Months Ended
Sep. 30, 2022
Oct. 31, 2022
Document And Entity [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Entity Registrant Name EVERSOURCE ENERGY  
Entity Incorporation, State or Country Code MA  
Entity Address, Address Line One 300 Cadwell Drive  
Entity Address, City or Town Springfield  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 01104  
City Area Code 800  
Local Phone Number 286-5000  
Entity File Number 001-05324  
Entity Tax Identification Number 04-2147929  
Title of 12(b) Security Common Shares, $5.00 par value per share  
Trading Symbol ES  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Smaller Reporting Company false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   348,307,416
Entity Central Index Key 0000072741  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Amendment Flag false  
The Connecticut Light and Power Company    
Document And Entity [Line Items]    
Entity Registrant Name THE CONNECTICUT LIGHT AND POWER COMPANY  
Entity Incorporation, State or Country Code CT  
Entity Address, Address Line One 107 Selden Street  
Entity Address, City or Town Berlin  
Entity Address, State or Province CT  
Entity Address, Postal Zip Code 06037-1616  
City Area Code 800  
Local Phone Number 286-5000  
Entity File Number 000-00404  
Entity Tax Identification Number 06-0303850  
Entity Filer Category Non-accelerated Filer  
Entity Smaller Reporting Company false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   6,035,205
Entity Central Index Key 0000023426  
Current Fiscal Year End Date --12-31  
NSTAR Electric Company    
Document And Entity [Line Items]    
Entity Registrant Name NSTAR ELECTRIC COMPANY  
Entity Incorporation, State or Country Code MA  
Entity Address, Address Line One 800 Boylston Street  
Entity Address, City or Town Boston  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02199  
City Area Code 800  
Local Phone Number 286-5000  
Entity File Number 001-02301  
Entity Tax Identification Number 04-1278810  
Entity Filer Category Non-accelerated Filer  
Entity Smaller Reporting Company false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   200
Entity Central Index Key 0000013372  
Current Fiscal Year End Date --12-31  
Public Service Company of New Hampshire    
Document And Entity [Line Items]    
Entity Registrant Name PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE  
Entity Incorporation, State or Country Code NH  
Entity Address, Address Line One Energy Park  
Entity Address, Address Line Two 780 North Commercial Street  
Entity Address, City or Town Manchester  
Entity Address, State or Province NH  
Entity Address, Postal Zip Code 03101-1134  
City Area Code 800  
Local Phone Number 286-5000  
Entity File Number 001-06392  
Entity Tax Identification Number 02-0181050  
Entity Filer Category Non-accelerated Filer  
Entity Smaller Reporting Company false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   301
Entity Central Index Key 0000315256  
Current Fiscal Year End Date --12-31