MERGER OF NU AND NSTAR (Tables)

3 Months Ended

Mar. 31, 2012

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 Purchase Price Allocation [Table Text Block]

(Millions of Dollars)
Current Assets	$	746
Property Plant and Equipment, Net		5,150
Goodwill		3,231
Other Long-Term Assets, excluding Goodwill		2,131
Current Liabilities		(1,320)
Long-Term Liabilities		(2,721)
Long-Term Debt and Other Long-Term Obligations		(2,140)
Preferred Stock of Subsidiary		(39)
Total Purchase Price	$	5,038

Business Acquisition, Pro Forma Information [Table Text Block]

	For the Three Months Ended March 31,
(Pro forma amounts in millions, except per share amounts)	2012		2011
Revenues	$	1,830	$	2,072
Net Income Attributable to Controlling Interests		108		185
Basic and Diluted Earnings per Share		0.34		0.59