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MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of December 31,
		2014												2013
					Pre-Tax			Pre-Tax									Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized						Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains			Losses			Fair Value			Cost			Gains			Losses			Fair Value
NU
	Debt Securities⁽¹⁾	$	313.0		$	7.5		$	(0.3)		$	320.2		$	299.2		$	2.5		$	(2.1)		$	299.6
	Equity Securities⁽¹⁾		160.6			73.3			-			233.9			163.6			60.5			-			224.1
WMECO
	Debt Securities⁽²⁾		58.2			-			(0.1)			58.1			57.9			-			-			57.9

Investments Classified by Contractual Maturity Date [Table Text Block]

		NU						WMECO
		Amortized						Amortized
(Millions of Dollars)		Cost			Fair Value			Cost			Fair Value
Less than one year⁽¹⁾		$	55.0		$	55.0		$	28.7		$	28.7
One to five years			88.8			89.1			25.8			25.8
Six to ten years			66.0			67.7			0.7			0.7
Greater than ten years			103.2			108.4			3.0			2.9
Total Debt Securities		$	313.0		$	320.2		$	58.2		$	58.1

Fair Value Heirarchy [Table Text Block]

				NU						WMECO
				As of December 31,						As of December 31,
(Millions of Dollars)				2014			2013			2014			2013
Level 1:
	Mutual Funds and Equities			$	319.0		$	281.3		$	-		$	-
	Money Market Funds				24.9			32.9			4.3			10.9
Total Level 1				$	343.9		$	314.2		$	4.3		$	10.9
Level 2:
	U.S. Government Issued Debt Securities (Agency and Treasury)			$	51.3		$	61.4		$	-		$	6.8
	Corporate Debt Securities				49.1			53.6			14.7			15.1
	Asset-Backed Debt Securities				54.1			30.4			14.5			9.0
	Municipal Bonds				116.3			105.5			13.0			11.2
	Other Fixed Income Securities				24.5			15.8			11.6			4.9
Total Level 2				$	295.3		$	266.7		$	53.8		$	47.0
Total Marketable Securities				$	639.2		$	580.9		$	58.1		$	57.9