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Cover
Nov. 03, 2020
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 03, 2020
Entity File Number 1-5324
Entity Registrant Name EVERSOURCE ENERGY
Entity Central Index Key 0000072741
Entity Tax Identification Number 04-2147929
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Shares, $5.00 par value per share
Trading Symbol ES
Security Exchange Name NYSE
Entity Emerging Growth Company false
The Connecticut Light And Power Company  
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 03, 2020
Entity File Number 0-00404
Entity Registrant Name THE CONNECTICUT LIGHT AND POWER COMPANY
Entity Central Index Key 0000023426
Entity Tax Identification Number 06-0303850
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Nstar Electric Company  
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 03, 2020
Entity File Number 1-02301
Entity Registrant Name NSTAR ELECTRIC COMPANY
Entity Central Index Key 0000013372
Entity Tax Identification Number 04-1278810
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Public Service Company Of New Hampshire  
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 03, 2020
Entity File Number 1-6392
Entity Registrant Name PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE
Entity Central Index Key 0000315256
Entity Tax Identification Number 02-0181050
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false