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Summary of Significant Accounting Policies (Summary Of Excise Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Duke Energy Carolinas [Member]
Excise taxes	$ 153	$ 156	$ 132
Duke Energy Ohio [Member]
Excise taxes	109	115	117
Duke Energy Indiana [Member]
Excise taxes	31	29	27
Duke Energy Corp [Member]
Excise taxes	$ 293	$ 300	$ 276

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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