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COMMON SHARES (Tables)
3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Schedule of Stock by Class
The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric, PSNH and WMECO that were authorized and issued, as well as the respective per share par values:  
 
Shares
 
 
 
Authorized as of March 31, 2017 and
 
Issued as of
 
Par Value
 
December 31, 2016
 
March 31, 2017
 
December 31, 2016
Eversource
$
5

 
380,000,000

 
333,878,402

 
333,878,402

CL&P
$
10

 
24,500,000

 
6,035,205

 
6,035,205

NSTAR Electric
$
1

 
100,000,000

 
100

 
100

PSNH
$
1

 
100,000,000

 
301

 
301

WMECO
$
25

 
1,072,471

 
434,653

 
434,653