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Related Parties (Narrative) (Details) (Duke Energy Ohio [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Intercompany loan payable	$ 306	$ 43
Decam [Member]
Related Party Transaction [Line Items]
Intercompany loan payable	$ 305	$ 43

The amount for notes payable (written promise to pay), due to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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