2.2.0.7 true Variable Interest Entities (Table 2) (Details) (USD $) 41003 - Disclosure - Variable Interest Entities (Table 2) (Details) true false In Millions false false 1 USD false false Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit12 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 3 Investments in equity method unconsolidated affiliates 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Investments In Affiliates Subsidiaries... false false false false false false false false false false false terselabel false 1 true true false false 125000000 125 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Investments In Affiliates Subsidiaries Associates And Joint Ventures No authoritative reference available. false 4 Intangibles 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieIntangibleAssetsNetExcludingGoodwill duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Intangible Assets Net Excluding Goodwill false false false false false false false false false false false terselabel false 1 false true false false 120000000 120 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Intangible Assets Net Excluding Goodwill No authoritative reference available. false 5 Total Assets 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current false false false false false false false false false false false totallabel false 1 false true false false 245000000 245 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current No authoritative reference available. true 6 Other Current Liabilities 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedLiabilitiesUnconsolidatedVieOtherCurrentLiabilities duk false credit instant Variable Interest Entity Carrying Amount Of Collateralized Liabilities Unconsolidated Vie Other Current Liabilities false false false false false false false false false false false terselabel false 1 false true false false 2000000 2 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Liabilities Unconsolidated Vie Other Current Liabilities No authoritative reference available. false 7 Deferred Credits and Other Liabilities 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedLiabilitiesUnconsolidatedVieDeferredCreditsAndOtherLiabilities duk false credit instant Variable Interest Entity Carrying Amount Of Collateralized Liabilities Unconsolidated Vie Deferred Credits and Other... false false false false false false false false false false false terselabel false 1 false true false false 30000000 30 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Liabilities Unconsolidated Vie Deferred Credits and Other Liabilities No authoritative reference available. false 8 Total Liabilities 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedLiabilitiesUnconsolidatedVieTotalLiabilities duk false credit instant Variable Interest Entity carrying amount of collateralized liabilities unconsolidated VIE total liabilities. false false false false false false false false false false false terselabel false 1 false true false false 32000000 32 false false false xbrli:monetaryItemType monetary Variable Interest Entity carrying amount of collateralized liabilities unconsolidated VIE total liabilities. No authoritative reference available. false 9 Net Duke Energy Corporation Shareholder's Equity 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedShareholdersEquityUnconsolidatedVieShareholdersEquityNet duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net false false false false false false false false false false false totallabel false 1 false true false false 213000000 213 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net No authoritative reference available. true 10 Wind Assets [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurevariableinterestentitiestable2details false 1 false false false false 0 0 false false false false 2 USD true false false false Wind Assets [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi duk_WindAssetsMember dei_LegalEntityAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 12 Investments in equity method unconsolidated affiliates 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Investments In Affiliates Subsidiaries... false false false false false false false false false false false terselabel false 1 false true false false 100000000 100 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Investments In Affiliates Subsidiaries Associates And Joint Ventures No authoritative reference available. false 14 Total Assets 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current false false false false false false false false false false false totallabel false 1 false true false false 100000000 100 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current No authoritative reference available. true 18 Net Duke Energy Corporation Shareholder's Equity 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedShareholdersEquityUnconsolidatedVieShareholdersEquityNet duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net false false false false false false false false false false false totallabel false 1 false true false false 100000000 100 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net No authoritative reference available. true 19 Other VIEs [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurevariableinterestentitiestable2details false 1 false false false false 0 0 false false false false 3 USD true false false false Other VIEs [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi duk_OtherViesMember dei_LegalEntityAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 21 Investments in equity method unconsolidated affiliates 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Investments In Affiliates Subsidiaries... false false false false false false false false false false false terselabel false 1 false true false false 25000000 25 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Investments In Affiliates Subsidiaries Associates And Joint Ventures No authoritative reference available. false 22 Intangibles 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieIntangibleAssetsNetExcludingGoodwill duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Intangible Assets Net Excluding Goodwill false false false false false false false false false false false terselabel false 1 false true false false 120000000 120 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Intangible Assets Net Excluding Goodwill No authoritative reference available. false 23 Total Assets 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current false false false false false false false false false false false totallabel false 1 false true false false 145000000 145 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current No authoritative reference available. true 24 Other Current Liabilities 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedLiabilitiesUnconsolidatedVieOtherCurrentLiabilities duk false credit instant Variable Interest Entity Carrying Amount Of Collateralized Liabilities Unconsolidated Vie Other Current Liabilities false false false false false false false false false false false terselabel false 1 false true false false 2000000 2 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Liabilities Unconsolidated Vie Other Current Liabilities No authoritative reference available. false 25 Deferred Credits and Other Liabilities 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedLiabilitiesUnconsolidatedVieDeferredCreditsAndOtherLiabilities duk false credit instant Variable Interest Entity Carrying Amount Of Collateralized Liabilities Unconsolidated Vie Deferred Credits and Other... false false false false false false false false false false false terselabel false 1 false true false false 30000000 30 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Liabilities Unconsolidated Vie Deferred Credits and Other Liabilities No authoritative reference available. false 26 Total Liabilities 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedLiabilitiesUnconsolidatedVieTotalLiabilities duk false credit instant Variable Interest Entity carrying amount of collateralized liabilities unconsolidated VIE total liabilities. false false false false false false false false false false false terselabel false 1 false true false false 32000000 32 false false false xbrli:monetaryItemType monetary Variable Interest Entity carrying amount of collateralized liabilities unconsolidated VIE total liabilities. No authoritative reference available. false 27 Net Duke Energy Corporation Shareholder's Equity 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedShareholdersEquityUnconsolidatedVieShareholdersEquityNet duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net false false false false false false false false false false false totallabel false 1 false true false false 113000000 113 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net No authoritative reference available. true 28 Eliminations [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurevariableinterestentitiestable2details false 1 false false false false 0 0 false false false false 4 USD true false false false Eliminations [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi duk_EliminationsMember dei_LegalEntityAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 29 Receivables 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Receivables Net Current false false false false false false false false false false false terselabel false 1 false true false false -239000000 -239 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Receivables Net Current No authoritative reference available. false 32 Total Assets 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current false false false false false false false false false false false totallabel false 1 false true false false -239000000 -239 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current No authoritative reference available. true 36 Net Duke Energy Corporation Shareholder's Equity 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedShareholdersEquityUnconsolidatedVieShareholdersEquityNet duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net false false false false false false false false false false false totallabel false 1 false true false false -239000000 -239 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net No authoritative reference available. true 37 Cinergy Receivables- Duke Energy Ohio [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurevariableinterestentitiestable2details false 1 false false false false 0 0 false false false false 5 USD true false false false Cinergy Receivables- Duke Energy Ohio [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi duk_CinergyReceivablesDukeEnergyOhioMember dei_LegalEntityAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 38 Receivables 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Receivables Net Current false false false false false false false false false false false terselabel false 1 false true false false 116000000 116 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Receivables Net Current No authoritative reference available. false 41 Total Assets 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current false false false false false false false false false false false totallabel false 1 false true false false 116000000 116 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current No authoritative reference available. true 45 Net Duke Energy Corporation Shareholder's Equity 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedShareholdersEquityUnconsolidatedVieShareholdersEquityNet duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net false false false false false false false false false false false totallabel false 1 false true false false 116000000 116 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net No authoritative reference available. true 46 Cinergy Receivables- Duke Energy Indiana [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.duke-energy.com/taxonomy/role/disclosurevariableinterestentitiestable2details false 1 false false false false 0 0 false false false false 6 USD true false false false Cinergy Receivables- Duke Energy Indiana [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi duk_CinergyReceivablesDukeEnergyIndianaMember dei_LegalEntityAxis explicitMember Unit13 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 47 Receivables 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Receivables Net Current false false false false false false false false false false false terselabel false 1 false true false false 123000000 123 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Receivables Net Current No authoritative reference available. false 50 Total Assets 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedAssetsUnconsolidatedVieReceivablesNetCurrent duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current false false false false false false false false false false false totallabel false 1 false true false false 123000000 123 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Assets Unconsolidated Vie Receivables Net Current No authoritative reference available. true 54 Net Duke Energy Corporation Shareholder's Equity 2 duk_VariableInterestEntityCarryingAmountOfCollateralizedShareholdersEquityUnconsolidatedVieShareholdersEquityNet duk false debit instant Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net false false false false false false false false false false false totallabel false 1 true true false false 123000000 123 false false false xbrli:monetaryItemType monetary Variable Interest Entity Carrying Amount Of Collateralized Shareholder's Equity Unconsolidated Vie Shareholder's Equity, Net No authoritative reference available. true 1 31 false Millions UnKnown UnKnown false true