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Provision for Uncollectible Accounts (Tables)
6 Months Ended
Jun. 30, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable Text Block
(Millions of Dollars) As of June 30, 2014 As of December 31, 2013
NU  $197.4 $171.3
CL&P   91.8  82.0
NSTAR Electric  44.4  41.7
PSNH  9.2  7.4
WMECO  12.9  10.0