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No authoritative reference available. false 12 Income from continuing operations attributable to Duke Energy common shareholders, as adjusted for participating securities-basic, Income 2 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 669000000 669 false false false 2 false true false false 110000000 110 false false false 3 false true false false 891000000 891 false false false 4 false true false false 727000000 727 false false false xbrli:monetaryItemType monetary Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 false 28 Stock options, performance and unvested stock 2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements us-gaap true na duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2000000 2 false false false 2 false true false false 1000000 1 false false false 3 false true false false 1000000 1 false false false 4 false true false false 1000000 1 false false false xbrli:sharesItemType shares Aggregate awards of share options and nonvested shares to be issued to an employee under a share-based compensation arrangement are considered options for purposes of computing diluted earnings per share. Such share-based awards shall be considered to be outstanding as of the grant date for purposes of computing diluted earnings per share even though their exercise may be contingent upon vesting. Those share-based awards are included in the diluted Earnings Per Share (EPS) computation even if the employee may not receive (or be able to sell) the stock until some future date. Accordingly, all shares to be issued shall be included in computing diluted EPS if the effect is dilutive. The dilutive effect of share-based compensation arrangements shall be computed using the treasury stock method. If the equity share options or other equity instruments are outstanding for only part of a period, the shares issuable shall be weighted to reflect the portion of the period during which the equity instruments were outstanding. 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