Provision for Uncollectible Accounts (Tables)

12 Months Ended

Dec. 31, 2012

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Accounts Notes Loans And Financing Receivable Text Block

	As of December 31,
(Millions of Dollars)	2012		2011
NU (2)	$	165.5	$	115.7
CL&P (2)		77.6		83.5
NSTAR Electric (1)		44.1		27.1
PSNH		6.8		7.2
WMECO (2)		8.5		10.0