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SHORT-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Debt
The amount of borrowings outstanding and available under the commercial paper programs and revolving credit facility was as follows:
 
Borrowings Outstanding
 as of December 31,
 
Available Borrowing Capacity as of December 31,
 
Weighted-Average Interest Rate as of December 31,
(Millions of Dollars)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Eversource Parent Commercial Paper Program
$
979.3

 
$
1,022.0

 
$
470.7

 
$
428.0

 
1.86
%
 
0.88
%
NSTAR Electric Commercial Paper Program
234.0

 
126.5

 
416.0

 
323.5

 
1.55
%
 
0.71
%
Revolving Credit Facility (1)
76.0

 
N/A

 
24.0

 
N/A

 
2.66
%
 
N/A