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Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations available to Duke Energy common stockholders excluding impact of participating securities and including accumulated preferred stock dividends |  |  |  |  |  |  |  |  | $ 3,694 | $ 2,642 | $ 3,059
Weighted average common shares outstanding – basic and diluted |  |  |  |  |  |  |  |  | 729 | 708 | 700
EPS from continuing operations available to Duke Energy common stockholders, Basic and diluted (in usd per share) | $ 0.89 | $ 1.82 | $ 1.12 | $ 1.24 | $ 0.62 | $ 1.51 | $ 0.72 | $ 0.88 | $ 5.07 | $ 3.73 | $ 4.37
Potentially dilutive items excluded from the calculation(in shares) |  |  |  |  |  |  |  |  | 2 | 2 | 2
Dividends declared per share (usd per share) |  |  |  |  |  |  |  |  | $ 3.75 | $ 3.64 | $ 3.49
Dividends declared on Series A preferred stock per depositary share (in usd per share) |  |  |  |  |  |  |  |  | $ 1.03 |  |

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- Definition Amount after tax of income (loss) from continuing operations attributable to parent, excluding the impact of participating securities. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares. + References No definition available. + Details
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