MERGER OF NU AND NSTAR (Tables)

12 Months Ended

Dec. 31, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule of Business Acquisitions by Acquisition Equity Interest Issued or Issuable [Table Text Block]

NSTAR common shares outstanding as of April 9, 2012 (in thousands)*		103,696
Exchange ratio		1.312
NU common shares issued for NSTAR common shares outstanding (in thousands)		136,049
Closing price of NU common shares on April 9, 2012	$	36.79
Value of common shares issued (in millions)	$	5,005
Fair value of NU replacement stock-based compensation awards related to pre-merger service (in millions)		33
Total purchase price (in millions)	$	5,038

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

Business Acquisition, Pro Forma Information

(Pro forma amounts in millions, except per share amounts)	For the Year Ended December 31, 2012
Operating Revenues	$	7,004
Net Income Attributable to Controlling Interest		630
Basic EPS		2.00
Diluted EPS		1.99

Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]

(Millions of Dollars)	For the Year Ended December 31, 2012
Transaction and Other Costs	$	32
Settlement Agreement Impacts		60
Total After-Tax Non-Recurring Costs Excluded from Pro Forma Net Income Attributable to Controlling Interest	$	92

(Millions of Dollars)	NU		CL&P		NSTAR Electric		WMECO
Customer Rate Credits	$	46	$	25	$	15	$	3
Storm Costs Deferral Reduction		40		40		-		-
Establishment of Energy Efficiency Fund		15		-		-		-
Total Pre-Tax Settlement Agreement Impacts	$	101	$	65	$	15	$	3