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Special Deposits and Counterparty Deposits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Special Deposits [Line Items]
Rate Reduction Bond Deposits	$ 29.5	$ 53.1
Other Deposits	17.7	29.9
Restricted Cash And Cash Equivalents	17.9
The Connecticut Light And Power Company [Member]
Special Deposits [Line Items]
Rate Reduction Bond Deposits	0	22.1
Other Deposits	1.1	2.1
Public Service Company Of New Hampshire [Member]
Special Deposits [Line Items]
Rate Reduction Bond Deposits	24.4	26.9
Other Deposits	2.5	2.8
Restricted Cash And Cash Equivalents	9.4
Western Massachusetts Electric Company [Member]
Special Deposits [Line Items]
Rate Reduction Bond Deposits	5.1	4.1
Other Deposits	2.2	1.2
Restricted Cash And Cash Equivalents	$ 7.0

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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