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Summary of Significant Accounting Policies Summary of Significant Accounting Policies Revenue Recognition (Details) (Kansas City Power and Light Company [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Kansas City Power and Light Company [Member]
Excise and Sales Taxes	$ 55.8	$ 55.6	$ 54.3

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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