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Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |
Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities | $ 819 | $ 504 | $ 1,718 | $ 1,123
Weighted average common shares outstanding – basic (in shares) | 728 | 703 | 728 | 702
Equity Forwards (in shares) |  | 1 |  |
Weighted average common shares outstanding – diluted (in shares) | 728 | 704 | 728 | 702
Earnings per share from continuing operations attributable to Duke Energy common stockholders, Basic and Diluted (in usd per share) | $ 1.12 | $ 0.72 | $ 2.36 | $ 1.60
Potentially dilutive items excluded from the calculation (in shares) | 2 | 2 | 2 | 2
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends declared per common share (in usd per share) | $ 0.928 | $ 0.89 | $ 1.855 | $ 1.78
Depositary Share [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Dividends declared on preferred stock per depositary share (in usd per share) | $ 0.307 |  | $ 0.307 |

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