Other Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Excise And Sales Taxes	$ 36.4	$ 35.0	$ 102.0	$ 105.8
The Connecticut Light And Power Company [Member]
Excise And Sales Taxes	$ 34.4	$ 33.0	$ 91.5	$ 93.2

- 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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