Other Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Excise And Sales Taxes	$ 33.0	$ 30.5	$ 71.4	$ 65.5
The Connecticut Light And Power Company [Member]
Excise And Sales Taxes	$ 29.8	$ 27.7	$ 61.8	$ 57.1

- 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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