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Common Stock (Earnings Per Share Data)(Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities $ 619 $ 715
Average shares, basic 701 700
Average shares, diluted 701 700
EPS, basic (usd per share) $ 0.88 $ 1.02
EPS, diluted (usd per share) $ 0.88 $ 1.02
Number of stock options and performance and unvested stock awards excluded from the dilutive securities calculation 2 2
Dividends declared per share (usd per share) $ 0.89 $ 0.855