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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Common Stock [Line Items]        
Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities $ 954 $ 998 $ 2,356 $ 2,194
Average shares, basic 700 689 700 689
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements   2   1
Average shares, diluted 700 691 700 690
EPS, basic (usd per share) $ 1.36 $ 1.44 $ 3.37 $ 3.19
EPS, diluted (usd per share) $ 1.36 $ 1.44 $ 3.37 $ 3.18
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) $ 0.89 $ 0.855 $ 2.6 $ 2.505