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Acquisitions and Dispositions (NCEMPA Assets Acquired) (Details) - Duke Energy Progress [Member] - NCEMPA Generating Assets [Member]
$ in Millions
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]  
Inventory $ 56
Property, plant and equipment, net 845
Total assets 901
Acquisition adjustment, recorded within property, plant and equipment 350
Total purchase price $ 1,251