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Acquisitions, Dispositions and Sales of Other Assets (Pro Forma Financial Information) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]                      
Costs to achieve the merger $ 33us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 56us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 61us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 55us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 72us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 88us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 82us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 55us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 205us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 297us-gaap_BusinessCombinationAcquisitionRelatedCosts  
Revenues                     23,976us-gaap_BusinessAcquisitionsProFormaRevenue
Net Income Attributable to Duke Energy Corporation                     2,417us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Pro Forma Basic and Diluted Earnings Per Share                     $ 3.43duk_ProFormaBasicandDilutedEarningsPerShare
Excluded From Pro Forma [Member]                      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]                      
Costs to achieve the merger                     $ 413us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_NonrecurringAdjustmentAxis
= duk_ExcludedFromProFormaMember