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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph b false 109 Reporting Segment Adjustments, Reclassifications [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurebusinesssegments false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 26 USD true false false false Reporting Segment Adjustments, Reclassifications [Member] us-gaap_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentsToConsolidatedAxis xbrldi http://xbrl.org/2006/xbrldi duk_ReportingSegmentAdjustmentsReclassificationsMember us-gaap_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentsToConsolidatedAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 27 USD true false false false Reporting Segment Adjustments, Reclassifications [Member] us-gaap_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentsToConsolidatedAxis xbrldi http://xbrl.org/2006/xbrldi duk_ReportingSegmentAdjustmentsReclassificationsMember us-gaap_SegmentReportingReconcilingItemsForOperatingProfitLossFromSegmentsToConsolidatedAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph c false 127 USFE And G Reporting Segment [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurebusinesssegments false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 28 USD true false false false USFE And G Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_UsfeAndGReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 29 USD true false false false USFE And G Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_UsfeAndGReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 30 USD true false false false USFE And G Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_UsfeAndGReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 31 USD true false false false USFE And G Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_UsfeAndGReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 32 USD true false false false USFE And G Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_UsfeAndGReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph c false 145 Commercial Power Reporting Segment [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurebusinesssegments false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 33 USD true false false false Commercial Power Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_CommercialPowerReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 34 USD true false false false Commercial Power Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_CommercialPowerReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 35 USD true false false false Commercial Power Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_CommercialPowerReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 36 USD true false false false Commercial Power Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_CommercialPowerReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 37 USD true false false false Commercial Power Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_CommercialPowerReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 150 Unaffiliated Revenues 2 duk_SegmentReportingSegmentRevenueUnaffiliated duk false debit duration Segment Reporting Segment Revenue Unaffiliated false false false false false false false false false false false terselabel false 1 false true false false 736000000 736 false false false 2 false true false false 608000000 608 [4] false false false 3 false true false false 1850000000 1850 [4] false false false 4 false true false false 1616000000 1616 [4] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Segment Reporting Segment Revenue Unaffiliated No authoritative reference available. false 151 Intersegment Revenues 2 duk_SegmentReportingIntersegmentRevenue duk false debit duration Total intersegment revenue for reportable segments false false false false false false false false false false false terselabel false 1 false true false false 1000000 1 false false false 2 false true false false 1000000 1 [4] false false false 3 false true false false 6000000 6 [4] false false false 4 false true false false 4000000 4 [4] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Total intersegment revenue for reportable segments No authoritative reference available. false 152 Total Revenues 2 us-gaap_SegmentReportingSegmentRevenue us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 737000000 737 false false false 2 false true false false 609000000 609 [4] false false false 3 false true false false 1856000000 1856 [4] false false false 4 false true false false 1620000000 1620 [4] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Total revenues for reportable segments. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph c false 163 International Energy Reporting Segment [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurebusinesssegments false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 38 USD true false false false International Energy Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_InternationalEnergyReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 39 USD true false false false International Energy Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_InternationalEnergyReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 40 USD true false false false International Energy Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_InternationalEnergyReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 41 USD true false false false International Energy Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_InternationalEnergyReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 42 USD true false false false International Energy Reporting Segment [Member] us-gaap_SegmentReportingInformationBySegmentAxis xbrldi http://xbrl.org/2006/xbrldi duk_InternationalEnergyReportingSegmentMember us-gaap_SegmentReportingInformationBySegmentAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 32 -Subparagraph c false 181 DukeNet Communications, LLC [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurebusinesssegments false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 43 USD true false false false DukeNet Communications, LLC [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi duk_DukenetCommunicationsLlcMember dei_LegalEntityAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. 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No authoritative reference available. false 200 Ownership interest in Duke Energy Trading and Marketing, LLC owned by Exxon Mobil Corporation 2 duk_OwnershipInterestPercentageOwnedByNonaffiliateEntity duk false na duration The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 0.4 0.4 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false us-types:percentItemType pure The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting, owned by nonaffiliate entity No authoritative reference available. false 1 Other within Interest Income and Other includes foreign currency transaction gains and losses and additional noncontrolling interest amounts not allocated to the reportable segments and Other results. 2 Primarily represents reclassification of federal tax balances in consolidation. 3 On December 7, 2009 and January 10, 2010, the North Carolina and South Carolina rate case settlement agreements were approved by the NCUC and PSCSC, respectively. Among other things, the rate case settlements included an annual base rate increase of $315 million in North Carolina to be phased-in primarily over a two-year period beginning January 1, 2010, and a $74 million annual base rate increase in South Carolina effective February 1, 2010. On July 8, 2009, the PUCO approved a $55 million annual increase in rates for electric delivery service. These new rates were effective July 13, 2009. Additionally, on December 29, 2009, the KPSC approved a $13 million increase in annual base natural gas rates. New rates went into effect January 4, 2010. As discussed in Note 3, in the third quarter of 2010, USFE&G recorded a $44 million charge to reflect the impact of a settlement agreement provision which reduces the return on equity for a portion of the Edwardsport integrated gasification combined cycle (IGCC) plant construction costs. 4 As discussed in Note 6, in the third quarter of 2009, Commercial Power recorded impairment charges of $413 million, which consisted of a $371 million goodwill impairment charge associated with the non-regulated Midwest generation operations and a $42 million charge to write-down the value of certain generating assets in the Midwest to their estimated fair value. In the second quarter of 2010, Commercial Power recorded impairment charges of $660 million, which consisted of a $500 million goodwill impairment charge associated with the non-regulated Midwest generation operations and a $160 million charge to write-down the value of certain non-regulated Midwest generating assets and emission allowances primarily associated with these generation assets. 5 55 false Millions UnKnown UnKnown false true