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Provision for Uncollectible Accounts (Tables)
9 Months Ended
Sep. 30, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable Text Block
(Millions of Dollars) As of September 30, 2014 As of December 31, 2013
NU  $181.4 $171.3
CL&P   85.8  82.0
NSTAR Electric  42.3  41.7
PSNH  7.9  7.4
WMECO  11.1  10.0