1.0.0.3 false Statement Of Income Alternative (USD $) In Millions, except Per Share data false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDperShareItemType Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 false 2 $ false false Shares Standard http://www.xbrl.org/2003/instance shares 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDperShareItemType Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 false 3 $ false false Shares Standard http://www.xbrl.org/2003/instance shares 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDperShareItemType Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 false 4 $ false false Shares Standard http://www.xbrl.org/2003/instance shares 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDperShareItemType Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares 0 5 Operating Revenues 3 us-gaap_RevenuesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 6 Regulated electric 4 us-gaap_ElectricDomesticRegulatedRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 2388000000 2388 false false 2 true true 2279000000 2279 false false 3 true true 4933000000 4933 false false 4 true true 4512000000 4512 false false No definition available. No authoritative reference available. false 7 Non-regulated electric, natural gas and other 4 us-gaap_UnregulatedOperatingRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 431000000 431 false false 2 false true 837000000 837 false false 3 false true 898000000 898 false false 4 false true 1584000000 1584 false false No definition available. No authoritative reference available. false 8 Regulated natural gas 4 us-gaap_GasDomesticRegulatedRevenue us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 94000000 94 false false 2 false true 113000000 113 false false 3 false true 394000000 394 false false 4 false true 470000000 470 false false No definition available. No authoritative reference available. false 9 Total operating revenues 4 us-gaap_Revenues us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 2913000000 2913 false false 2 false true 3229000000 3229 false false 3 false true 6225000000 6225 false false 4 false true 6566000000 6566 false false No definition available. No authoritative reference available. true 10 Operating Expenses 3 us-gaap_CostsAndExpensesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 11 Fuel used in electric generation and purchased power-regulated 4 us-gaap_CostOfDomesticRegulatedElectric us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 772000000 772 false false 2 false true 755000000 755 false false 3 false true 1621000000 1621 false false 4 false true 1441000000 1441 false false No definition available. No authoritative reference available. false 12 Fuel used in electric generation and purchased power-non-regulated 4 us-gaap_CostOfWorldwideUnregulatedElectric us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 157000000 157 false false 2 false true 288000000 288 false false 3 false true 305000000 305 false false 4 false true 554000000 554 false false No definition available. No authoritative reference available. false 13 Cost of natural gas and coal sold 4 duk_CostOfNaturalGasAndCoalSold duk false debit duration monetary No definition available. false false false false false false false false false 1 false true 54000000 54 false false 2 false true 83000000 83 false false 3 false true 276000000 276 false false 4 false true 362000000 362 false false No definition available. No authoritative reference available. false 14 Operation, maintenance and other 4 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 848000000 848 false false 2 false true 877000000 877 false false 3 false true 1659000000 1659 false false 4 false true 1662000000 1662 false false No definition available. No authoritative reference available. false 15 Depreciation and amortization 4 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 407000000 407 false false 2 false true 418000000 418 false false 3 false true 821000000 821 false false 4 false true 831000000 831 false false No definition available. No authoritative reference available. false 16 Property and other taxes 4 us-gaap_TaxesOtherThanIncomeExciseProductionAndPropertyTaxes us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 160000000 160 false false 2 false true 158000000 158 false false 3 false true 353000000 353 false false 4 false true 333000000 333 false false No definition available. No authoritative reference available. false 17 Total operating expenses 4 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2398000000 2398 false false 2 false true 2579000000 2579 false false 3 false true 5035000000 5035 false false 4 false true 5183000000 5183 false false No definition available. No authoritative reference available. true 18 Gains on Sales of Other Assets and Other, net 4 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 13000000 13 false false 2 false true 33000000 33 false false 3 false true 19000000 19 false false 4 false true 51000000 51 false false No definition available. No authoritative reference available. false 19 Operating Income 3 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 528000000 528 false false 2 false true 683000000 683 false false 3 false true 1209000000 1209 false false 4 false true 1434000000 1434 false false No definition available. No authoritative reference available. true 20 Other Income and Expenses 3 us-gaap_NonoperatingIncomeExpenseAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 21 Equity in earnings (losses) of unconsolidated affiliates 4 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 19000000 19 false false 2 false true -61000000 -61 false false 3 false true 25000000 25 false false 4 false true -18000000 -18 false false No definition available. No authoritative reference available. false 22 Other income and expenses, net 4 us-gaap_OtherNonoperatingIncomeExpense us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 100000000 100 false false 2 false true 75000000 75 false false 3 false true 122000000 122 false false 4 false true 149000000 149 false false No definition available. No authoritative reference available. false 23 Total other income and expenses 4 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 119000000 119 false false 2 false true 14000000 14 false false 3 false true 147000000 147 false false 4 false true 131000000 131 false false No definition available. No authoritative reference available. true 24 Interest Expense 3 us-gaap_InterestExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 186000000 186 false false 2 false true 194000000 194 false false 3 false true 370000000 370 false false 4 false true 376000000 376 false false No definition available. No authoritative reference available. false 25 Income From Continuing Operations Before Income Taxes 3 duk_IncomeLossFromContinuingOperationsBeforeIncomeTaxes duk false credit duration monetary No definition available. false false false false false false false false false 1 false true 461000000 461 false false 2 false true 503000000 503 false false 3 false true 986000000 986 false false 4 false true 1189000000 1189 false false No definition available. No authoritative reference available. true 26 Income Tax Expense from Continuing Operations 3 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 177000000 177 false false 2 false true 167000000 167 false false 3 false true 356000000 356 false false 4 false true 389000000 389 false false No definition available. No authoritative reference available. false 27 Income From Continuing Operations 3 duk_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest duk false credit duration monetary No definition available. false false false false false false false false false 1 false true 284000000 284 false false 2 false true 336000000 336 false false 3 false true 630000000 630 false false 4 false true 800000000 800 false false No definition available. No authoritative reference available. true 28 (Loss) Income From Discontinued Operations, net of tax 3 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -2000000 -2 false false 2 false true 13000000 13 false false 3 false true 1000000 1 false false 4 false true 15000000 15 false false No definition available. No authoritative reference available. false 29 Net Income 3 duk_ProfitLoss duk false credit duration monetary No definition available. false false false false false false false false false 1 false true 282000000 282 false false 2 false true 349000000 349 false false 3 false true 631000000 631 false false 4 false true 815000000 815 false false No definition available. No authoritative reference available. true 30 Less: Net Income (Loss) Attributable to Noncontrolling Interests 3 duk_NetIncomeLossAttributableToNoncontrollingInterest duk false debit duration monetary No definition available. false false false false false false false false false 1 false true 6000000 6 false false 2 false true -2000000 -2 false false 3 false true 11000000 11 false false 4 false true -1000000 -1 false false No definition available. No authoritative reference available. false 31 Net Income Attributable to Duke Energy Corporation 3 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 276000000 276 false false 2 true true 351000000 351 false false 3 true true 620000000 620 false false 4 true true 816000000 816 false false No definition available. No authoritative reference available. true 33 Income from continuing operations attributable to Duke Energy Corporation common shareholders 4 duk_EarningsPerShareFromContinuingOperationsAbstract duk false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 34 Basic 5 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.22 0.22 false false 2 true true 0.27 0.27 false false 3 true true 0.48 0.48 false false 4 true true 0.63 0.63 false false No definition available. No authoritative reference available. false 35 Diluted 5 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.22 0.22 false false 2 true true 0.27 0.27 false false 3 true true 0.48 0.48 false false 4 true true 0.63 0.63 false false No definition available. No authoritative reference available. false 36 Income from discontinued operations attributable to Duke Energy Corporation common shareholders 4 duk_EarningsPerShareFromDiscontinuedOperationsAbstract duk false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 37 Basic 5 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.00 0.00 false false 2 true true 0.01 0.01 false false 3 true true 0.00 0.00 false false 4 true true 0.01 0.01 false false No definition available. No authoritative reference available. false 38 Diluted 5 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.00 0.00 false false 2 true true 0.01 0.01 false false 3 true true 0.00 0.00 false false 4 true true 0.01 0.01 false false No definition available. No authoritative reference available. false 39 Net income attributable to Duke Energy Corporation common shareholders 4 us-gaap_EarningsPerShareAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 40 Basic 5 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.21 0.21 false false 2 true true 0.28 0.28 false false 3 true true 0.48 0.48 false false 4 true true 0.64 0.64 false false No definition available. No authoritative reference available. false 41 Diluted 5 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.21 0.21 false false 2 true true 0.28 0.28 false false 3 true true 0.48 0.48 false false 4 true true 0.64 0.64 false false No definition available. No authoritative reference available. false 42 Dividends per share 4 us-gaap_CommonStockDividendsPerShareDeclared us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0.47 0.47 false false 2 true true 0.45 0.45 false false 3 true true 0.70 0.70 false false 4 true true 0.67 0.67 false false No definition available. No authoritative reference available. false 43 Weighted-average shares outstanding 4 us-gaap_SharesUsedInComputationOfEarningsLossPerShareAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 44 Basic 5 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 1288000000 1288 false false 2 false true 1264000000 1264 false false 3 false true 1284000000 1284 false false 4 false true 1264000000 1264 false false No definition available. No authoritative reference available. false 45 Diluted 5 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 1289000000 1289 false false 2 false true 1266000000 1266 false false 3 false true 1285000000 1285 false false 4 false true 1266000000 1266 false false No definition available. No authoritative reference available. false false 4 40 false Millions Millions Hundreds false true