Other Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Excise And Sales Taxes	$ 137.8	$ 143.7	$ 135.6
The Connecticut Light And Power Company [Member]
Excise And Sales Taxes	$ 121.6	$ 128.0	$ 119.0

- 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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