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Equity Method Investments (Tables)
12 Months Ended
Dec. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Equity Method Investments [Table Text Block]
(Percent)CYAPC  YAEC  MYAPC 
CL&P 34.5   24.5   12.0 
NSTAR Electric 14.0   14.0   4.0 
PSNH 5.0   7.0   5.0 
WMECO 9.5   7.0   3.0 

 As of December 31,
(Millions of Dollars)2012 2011 (1)
CL&P$ 1.4 $ 1.4
NSTAR Electric  0.6   0.6
PSNH  0.3   0.3
WMECO  0.4   0.4