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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Carrying Amounts and Estimated Fair Values of Financial Instruments The fair values provided in the table below are classified as Level 2 within the fair value hierarchy.  Carrying amounts and estimated fair values are as follows:
 
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
(Millions of Dollars)
Carrying Amount
 
Fair Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
As of December 31, 2019:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stock Not Subject to Mandatory Redemption
$
155.6

 
$
162.0

 
$
116.2

 
$
117.8

 
$
43.0

 
$
44.2

 
$
—

 
$
—

Long-Term Debt
14,098.2

 
15,170.2

 
3,518.1

 
4,058.0

 
3,342.1

 
3,659.9

 
951.6

 
1,005.7

Rate Reduction Bonds
583.3

 
625.9

 
—

 
—

 
—

 
—

 
583.3

 
625.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2018:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stock Not Subject to Mandatory Redemption
$
155.6

 
$
156.8

 
$
116.2

 
$
113.8

 
$
43.0

 
$
43.0

 
$
—

 
$
—

Long-Term Debt
13,086.1

 
13,154.9

 
3,254.0

 
3,429.2

 
2,944.8

 
3,024.1

 
805.2

 
819.5

Rate Reduction Bonds
635.7

 
645.8

 
—

 
—

 
—

 
—

 
635.7

 
645.8