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Common Stock (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Equity [Abstract] |  |  |  |
Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities | $ 1,077 | $ 954 | $ 2,199 | $ 2,356
Average shares, basic | 713 | 700 | 705 | 700
Equity Forwards, shares | 1 |  | 1 |
Average shares, diluted | 714 | 700 | 706 | 700
EPS, basic (usd per share) | $ 1.51 | $ 1.36 | $ 3.12 | $ 3.37
EPS, diluted (usd per share) | $ 1.51 | $ 1.36 | $ 3.11 | $ 3.37
Number of stock options and performance and unvested stock awards excluded from the dilutive securities calculation | 2 | 2 | 2 | 2
Dividends declared per share (usd per share) | $ 0.9275 | $ 0.89 | $ 2.7075 | $ 2.60

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