QUARTERLY FINANCIAL DATA (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

NU Consolidated Statements of Quarterly Financial Data	Quarter Ended
(Millions of Dollars, except per share information)	March 31,		June 30,		September 30,		December 31,
2013
Operating Revenues	$	1,995.0	$	1,635.9	$	1,892.6	$	1,777.7
Operating Income		418.9		350.6		399.3		360.6
Net Income		230.0		173.1		211.4		179.2
Net Income Attributable to Controlling Interest		228.1		171.0		209.5		177.4
Basic and Diluted EPS (a)	$	0.72	$	0.54	$	0.66	$	0.56
2012 (1)
Operating Revenues	$	1,099.6	$	1,628.7	$	1,861.5	$	1,684.0
Operating Income		214.4		159.5		412.9		331.4
Net Income		100.8		46.2		209.5		176.6
Net Income Attributable to Controlling Interest		99.3		44.3		207.6		174.7
Basic and Diluted EPS (a)	$	0.56	$	0.15	$	0.66	$	0.55
(a) The summation of quarterly EPS data may not equal annual data due to rounding.
Statements of Quarterly Financial Data	Quarter Ended
(Millions of Dollars)	March 31,		June 30,		September 30,		December 31,
CL&P
2013
Operating Revenues	$	624.1	$	569.3	$	648.4	$	600.5
Operating Income		149.7		136.8		133.9		119.2
Net Income		85.0		67.9		66.3		60.2
2012
Operating Revenues	$	592.0	$	562.1	$	658.1	$	595.2
Operating Income		111.9		40.4		139.7		135.0
Net Income		54.0		6.9		74.9		73.9
NSTAR Electric
2013
Operating Revenues	$	592.3	$	570.4	$	753.9	$	576.9
Operating Income		94.5		112.5		192.0		109.2
Net Income		48.1		58.0		107.0		55.4
2012
Operating Revenues	$	556.5	$	534.6	$	693.7	$	516.2
Operating Income		22.5		93.9		194.1		70.9
Net Income		3.9		45.5		106.8		34.0
PSNH
2013
Operating Revenues	$	273.8	$	216.1	$	218.6	$	226.9
Operating Income		58.1		54.3		56.6		56.2
Net Income		29.0		27.2		28.4		26.8
2012
Operating Revenues	$	243.0	$	255.1	$	256.9	$	233.0
Operating Income		45.4		47.0		61.3		51.4
Net Income		21.3		21.2		27.2		27.2
WMECO
2013
Operating Revenues	$	125.0	$	115.0	$	121.8	$	110.9
Operating Income		35.6		32.4		28.9		22.4
Net Income		18.6		16.4		15.0		10.4
2012
Operating Revenues	$	114.0	$	106.8	$	112.5	$	107.9
Operating Income		28.7		25.1		28.1		28.9
Net Income		14.2		11.1		14.1		15.1