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</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stockholders' Equity [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_ParentMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Common Stockholders' Equity [Member]" /></Labels></Column><Column FlagID="0"><Id>10</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Entity [Domain]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>dei_EntityDomain</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Noncontrolling Interest [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_NoncontrollingInterestMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Entity [Domain]</string><string>Noncontrolling Interest [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Noncontrolling Interest [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_NoncontrollingInterestMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Noncontrolling Interest [Member]" /></Labels></Column><Column FlagID="0"><Id>11</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Carolinas [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyCarolinasMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Equity Component [Domain]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>us-gaap_EquityComponentDomain</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Carolinas [Member]</string><string>Equity Component [Domain]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Carolinas [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyCarolinasMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Carolinas [Member]" /></Labels></Column><Column FlagID="0"><Id>12</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Carolinas [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyCarolinasMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Members Equity [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_MembersEquityMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Carolinas [Member]</string><string>Members Equity [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Carolinas [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyCarolinasMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Members Equity [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_MembersEquityMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Carolinas [Member]" /><Label Key="" Id="1" Label="Members Equity [Member]" /></Labels></Column><Column FlagID="0"><Id>13</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Carolinas [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyCarolinasMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Cash Flow Hedges [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Carolinas [Member]</string><string>Net Gains (Losses) on Cash Flow Hedges [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Carolinas [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyCarolinasMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Cash Flow Hedges [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Carolinas [Member]" /><Label Key="" Id="1" Label="Net Gains (Losses) on Cash Flow Hedges [Member]" /></Labels></Column><Column FlagID="0"><Id>14</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Carolinas [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyCarolinasMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Available for Sale Securities [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Carolinas [Member]</string><string>Net Gains (Losses) on Available for Sale Securities [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Carolinas [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyCarolinasMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Available for Sale Securities [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Carolinas [Member]" /><Label Key="" Id="1" Label="Net Gains (Losses) on Available for Sale Securities [Member]" /></Labels></Column><Column FlagID="0"><Id>15</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Equity Component [Domain]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>us-gaap_EquityComponentDomain</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Progress Energy [Member]</string><string>Equity Component [Domain]</string></SegmentLabels><Unit><OtherUnits><UnitProperty><UnitID>Shares</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnitProperty></OtherUnits><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Progress Energy [Member]" /></Labels></Column><Column FlagID="0"><Id>16</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stock [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_CommonStockMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Progress Energy [Member]</string><string>Common Stock [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stock [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_CommonStockMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Progress Energy [Member]" /><Label Key="" Id="1" Label="Common Stock [Member]" /></Labels></Column><Column FlagID="0"><Id>17</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Additional Paid In Capital [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AdditionalPaidInCapitalMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Progress Energy [Member]</string><string>Additional Paid In Capital [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Additional Paid In Capital [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AdditionalPaidInCapitalMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Progress Energy [Member]" /><Label Key="" Id="1" Label="Additional Paid In Capital [Member]" /></Labels></Column><Column FlagID="0"><Id>18</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Retained Earnings [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_RetainedEarningsMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Progress Energy [Member]</string><string>Retained Earnings [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Retained Earnings [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_RetainedEarningsMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Progress Energy [Member]" /><Label Key="" Id="1" Label="Retained Earnings [Member]" /></Labels></Column><Column FlagID="0"><Id>19</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Cash Flow Hedges [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Progress Energy [Member]</string><string>Net Gains (Losses) on Cash Flow Hedges [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Cash Flow Hedges [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Progress Energy [Member]" /><Label Key="" Id="1" Label="Net Gains (Losses) on Cash Flow Hedges [Member]" /></Labels></Column><Column FlagID="0"><Id>20</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Pension And OPEB Related Adjustments To AOCI [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Progress Energy [Member]</string><string>Pension And OPEB Related Adjustments To AOCI [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Pension And OPEB Related Adjustments To AOCI [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Progress Energy [Member]" /><Label Key="" Id="1" Label="Pension And OPEB Related Adjustments To AOCI [Member]" /></Labels></Column><Column FlagID="0"><Id>21</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stockholders' Equity [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_ParentMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Progress Energy [Member]</string><string>Common Stockholders' Equity [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stockholders' Equity [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_ParentMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Progress Energy [Member]" /><Label Key="" Id="1" Label="Common Stockholders' Equity [Member]" /></Labels></Column><Column FlagID="0"><Id>22</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Noncontrolling Interest [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_NoncontrollingInterestMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Progress Energy [Member]</string><string>Noncontrolling Interest [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Progress Energy [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_ProgressEnergyMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Noncontrolling Interest [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_NoncontrollingInterestMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Progress Energy [Member]" /><Label Key="" Id="1" Label="Noncontrolling Interest [Member]" /></Labels></Column><Column FlagID="0"><Id>23</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Progress [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyProgressMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Equity Component [Domain]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>us-gaap_EquityComponentDomain</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Progress [Member]</string><string>Equity Component [Domain]</string></SegmentLabels><Unit><OtherUnits><UnitProperty><UnitID>Shares</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnitProperty></OtherUnits><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

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</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Progress [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyProgressMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stock [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_CommonStockMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Progress [Member]" /><Label Key="" Id="1" Label="Common Stock [Member]" /></Labels></Column><Column FlagID="0"><Id>25</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Progress [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyProgressMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Retained Earnings [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_RetainedEarningsMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Progress [Member]</string><string>Retained Earnings [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Progress [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyProgressMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Retained Earnings [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_RetainedEarningsMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Progress [Member]" /><Label Key="" Id="1" Label="Retained Earnings [Member]" /></Labels></Column><Column FlagID="0"><Id>26</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Progress [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyProgressMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Cash Flow Hedges [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Progress [Member]</string><string>Net Gains (Losses) on Cash Flow Hedges [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Progress [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyProgressMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Cash Flow Hedges [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Progress [Member]" /><Label Key="" Id="1" Label="Net Gains (Losses) on Cash Flow Hedges [Member]" /></Labels></Column><Column FlagID="0"><Id>27</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Florida [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyFloridaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Equity Component [Domain]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>us-gaap_EquityComponentDomain</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Florida [Member]</string><string>Equity Component [Domain]</string></SegmentLabels><Unit><OtherUnits><UnitProperty><UnitID>Shares</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnitProperty></OtherUnits><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Florida [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyFloridaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Florida [Member]" /></Labels></Column><Column FlagID="0"><Id>28</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Florida [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyFloridaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stock [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_CommonStockMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Florida [Member]</string><string>Common Stock [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Florida [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyFloridaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stock [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_CommonStockMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Florida [Member]" /><Label Key="" Id="1" Label="Common Stock [Member]" /></Labels></Column><Column FlagID="0"><Id>29</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Florida [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyFloridaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Retained Earnings [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_RetainedEarningsMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Florida [Member]</string><string>Retained Earnings [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Florida [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyFloridaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Retained Earnings [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_RetainedEarningsMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Florida [Member]" /><Label Key="" Id="1" Label="Retained Earnings [Member]" /></Labels></Column><Column FlagID="0"><Id>30</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Florida [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyFloridaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Cash Flow Hedges [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Florida [Member]</string><string>Net Gains (Losses) on Cash Flow Hedges [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Florida [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyFloridaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Net Gains (Losses) on Cash Flow Hedges [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Florida [Member]" /><Label Key="" Id="1" Label="Net Gains (Losses) on Cash Flow Hedges [Member]" /></Labels></Column><Column FlagID="0"><Id>31</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Ohio [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyOhioMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Equity Component [Domain]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>us-gaap_EquityComponentDomain</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Ohio [Member]</string><string>Equity Component [Domain]</string></SegmentLabels><Unit><OtherUnits><UnitProperty><UnitID>Shares</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnitProperty></OtherUnits><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Ohio [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyOhioMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Ohio [Member]" /></Labels></Column><Column FlagID="0"><Id>32</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Ohio [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyOhioMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stock [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_CommonStockMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Ohio [Member]</string><string>Common Stock [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Ohio [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyOhioMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Common Stock [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_CommonStockMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Ohio [Member]" /><Label Key="" Id="1" Label="Common Stock [Member]" /></Labels></Column><Column FlagID="0"><Id>33</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Ohio [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyOhioMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Additional Paid In Capital [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AdditionalPaidInCapitalMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Ohio [Member]</string><string>Additional Paid In Capital [Member]</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

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</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Ohio [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyOhioMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Pension And OPEB Related Adjustments To AOCI [Member]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Duke Energy Ohio [Member]" /><Label Key="" Id="1" Label="Pension And OPEB Related Adjustments To AOCI [Member]" /></Labels></Column><Column FlagID="0"><Id>36</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>dei_LegalEntityAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Duke Energy Indiana [Member]</ValueName><ValueType>dei_LegalEntityAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>duk_DukeEnergyIndianaMember</Id><dimensionId>dei_LegalEntityAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Equity Component [Domain]</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>us-gaap_EquityComponentDomain</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Duke Energy Indiana [Member]</string><string>Equity Component [Domain]</string></SegmentLabels><Unit><OtherUnits><UnitProperty><UnitID>Shares</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnitProperty></OtherUnits><UnderlyingUnitProperty><UnitID>USDollar</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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 -Section 45

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph A3

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 55

 -Paragraph 4I

 -URI http://asc.fasb.org/extlink&amp;oid=18733213&amp;loc=SL4590271-111686



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 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 505

 -SubTopic 10

 -Section 50

 -Paragraph 2

 -URI http://asc.fasb.org/extlink&amp;oid=6928386&amp;loc=d3e21463-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 220

 -SubTopic 10

 -Section 45

 -Paragraph 1A

 -URI http://asc.fasb.org/extlink&amp;oid=20435746&amp;loc=SL7669619-108580



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UnitID=""><Id>39</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell><Cell FlagID="0" ContextID="" UnitID=""><Id>40</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 505

 -SubTopic 10

 -Section S99

 -Paragraph 1

 -Subparagraph (SX 210.3-04)

 -URI http://asc.fasb.org/extlink&amp;oid=6959260&amp;loc=d3e187085-122770



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph 38

 -Subparagraph c(2)

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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 -Paragraph 26

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 45

 -Paragraph 15

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 -Paragraph 25

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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 -SubTopic 10

 -Section 45

 -Paragraph 16

 -URI http://asc.fasb.org/extlink&amp;oid=7656940&amp;loc=SL4568740-111683



Reference 5: http://www.xbrl.org/2003/role/presentationRef

 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph A3

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 55

 -Paragraph 4I

 -URI http://asc.fasb.org/extlink&amp;oid=18733213&amp;loc=SL4590271-111686



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 -Publisher AICPA

 -Name Accounting Principles Board Opinion (APB)

 -Number 12

 -Paragraph 10

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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 -Number 210

 -Section 04

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 210

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 02

 -Paragraph 30

 -Article 5



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 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 505

 -SubTopic 10

 -Section 50

 -Paragraph 2

 -URI http://asc.fasb.org/extlink&amp;oid=6928386&amp;loc=d3e21463-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 220

 -SubTopic 10

 -Section 45

 -Paragraph 1A

 -URI http://asc.fasb.org/extlink&amp;oid=20435746&amp;loc=SL7669619-108580



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/><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:monetaryItemType</ElementDataType><SimpleDataType>monetary</SimpleDataType><ElementDefenition>Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 505

 -SubTopic 10

 -Section S99

 -Paragraph 1

 -Subparagraph (SX 210.3-04)

 -URI http://asc.fasb.org/extlink&amp;oid=6959260&amp;loc=d3e187085-122770



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph 38

 -Subparagraph c(2)

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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 -Paragraph A3

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 55

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 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph 26

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 45

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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 -Paragraph 25

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

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 -Topic 810

 -SubTopic 10

 -Section 45

 -Paragraph 16

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

 -Number 51

 -Paragraph A3

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 810

 -SubTopic 10

 -Section 55

 -Paragraph 4I

 -URI http://asc.fasb.org/extlink&amp;oid=18733213&amp;loc=SL4590271-111686



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