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Common Stock (Earnings Per Share Data)(Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Common Stock [Line Items]        
Income from continuing operations attributable to Duke Energy common stockholders excluding impact of participating securities $ 687 $ 621 $ 1,402 $ 1,195
Average shares, basic 700 689 700 689
Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements   1    
Average shares, diluted 700 690 700 689
EPS, basic (usd per share) $ 0.98 $ 0.90 $ 2.00 $ 1.73
EPS, diluted (usd per share) $ 0.98 $ 0.90 $ 2.00 $ 1.73
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) $ 0.855 $ 0.825 $ 1.71 $ 1.65