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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Goodwill as adjusted for accumulated impairment charges1Amounts represent purchase price adjustments related to the Progress Energy merger at USFE&G, a minor renewables acquisition at Commercial Power and the Ibener acquisition at International Energy. See Note 2 for further information on purchase price adjustments related to the Progress Energy Merger.falseGoodwill (Goodwill By Reportable Operating Segment) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.duke-energy.com/role/GoodwillGoodwillByReportableOperatingSegmentDetails245