Provision for Uncollectible Accounts (Tables)

12 Months Ended

Dec. 31, 2011

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Accounts Notes Loans And Financing Receivable Text Block

	As of December 31,
(Millions of Dollars)	2011		2010
NU	$	34.9	$	39.8
CL&P		14.8		17.2
PSNH		7.2		6.8
WMECO		4.6		6.0