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Acquisitions and Dispositions (Plants in Disposal Group) (Details) - Duke Energy Ohio [Member]
3 Months Ended
Mar. 31, 2015
MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 9,225
Owned Average MW Capacity 5,884
Stuart [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 2,308
Owned Average MW Capacity 900
Ownership Interest 39.00%
Zimmer [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 1,300
Owned Average MW Capacity 605
Ownership Interest 46.50%
Hanging Rock [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 1,226
Owned Average MW Capacity 1,226
Ownership Interest 100.00%
Miami Fort Units 7 and 8 [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 1,020
Owned Average MW Capacity 652
Ownership Interest 64.00%
Conesville [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 780
Owned Average MW Capacity 312
Ownership Interest 40.00%
Washington [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 617
Owned Average MW Capacity 617
Ownership Interest 100.00%
Fayette [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 614
Owned Average MW Capacity 614
Ownership Interest 100.00%
Killen [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 600
Owned Average MW Capacity 198
Ownership Interest 33.00%
Lee [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 568
Owned Average MW Capacity 568
Ownership Interest 100.00%
Dicks Creek [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 136
Owned Average MW Capacity 136
Ownership Interest 100.00%
Miami Fort [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Total Average MW Capacity 56
Owned Average MW Capacity 56
Ownership Interest 100.00%