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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