Other Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Excise And Sales Taxes	$ 30.5	$ 32.0	$ 65.5	$ 70.7
The Connecticut Light And Power Company [Member]
Excise And Sales Taxes	$ 27.7	$ 28.8	$ 57.1	$ 60.2

- Definition

The amount of excise and sales taxes included in sales and revenues, which are then deducted as a cost of sales. Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services.

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