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Provision for Uncollectible Accounts (Tables)
3 Months Ended
Mar. 31, 2016
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable Text Block
   Total Provision for Uncollectible Accounts Uncollectible Hardship
(Millions of Dollars) As of March 31, 2016 As of December 31, 2015 As of March 31, 2016 As of December 31, 2015
Eversource $197.6 $190.7 $118.9 $118.5
CL&P   84.9  79.5  71.3  68.1
NSTAR Electric  51.5  52.6  22.7  25.3
PSNH  9.1  8.7   -   -
WMECO  13.6  14.0  7.1  7.4