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MARKETABLE SECURITIES (Tables)

6 Months Ended

Jun. 30, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of June 30, 2013
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains⁽¹⁾			Losses⁽¹⁾			Fair Value
NU
	Debt Securities⁽²⁾	$	333.4		$	6.5		$	(0.7)		$	339.2
	Equity Securities⁽²⁾		163.7			42.2			-			205.9

WMECO
	Debt Securities		57.8			-			(0.1)			57.7

		As of December 31, 2012
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains⁽¹⁾			Losses⁽¹⁾			Fair Value
NU
	Debt Securities⁽²⁾	$	266.6		$	13.3		$	(0.1)		$	279.8
	Equity Securities⁽²⁾		145.5			20.0			-			165.5

WMECO
	Debt Securities		57.7			0.1			(0.1)			57.7

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⁾		$	102.4		$	102.4		$	25.1		$	25.1
One to five years			73.7			74.5			23.7			23.6
Six to ten years			57.9			59.0			3.6			3.6
Greater than ten years			99.4			103.3			5.4			5.4
Total Debt Securities		$	333.4		$	339.2		$	57.8		$	57.7

Fair Value Heirarchy [Table Text Block]

				NU						WMECO
				As of						As of
(Millions of Dollars)				June 30, 2013			December 31, 2012			June 30, 2013			December 31, 2012
Level 1:
	Mutual Funds and Equities			$	257.2		$	212.5		$	-		$	-
	Money Market Funds				77.4			40.2			4.8			5.2
Total Level 1				$	334.6		$	252.7		$	4.8		$	5.2
Level 2:
	U.S. Government Issued Debt Securities
		(Agency and Treasury)		$	81.6		$	69.9		$	16.6		$	18.7
	Corporate Debt Securities				46.5			33.0			12.6			7.0
	Asset-Backed Debt Securities				29.9			28.5			10.5			10.9
	Municipal Bonds				89.1			93.8			9.7			11.6
	Other Fixed Income Securities				14.7			14.4			3.5			4.3
Total Level 2				$	261.8		$	239.6		$	52.9		$	52.5
Total Marketable Securities				$	596.4		$	492.3		$	57.7		$	57.7