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Business Segments (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 24, 2019
USD ($)
asset
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Segment Reporting Information [Line Items]          
Pretax (gain) loss on disposal   $ (3) $ (3)   $ 97
Operation, maintenance and other   1,434 1,544 $ 2,853 3,008
Duke Energy Ohio [Member]          
Segment Reporting Information [Line Items]          
Pretax (gain) loss on disposal         106
Operation, maintenance and other   123 $ 130 $ 255 $ 261
Number of reportable segments | segment       2  
Beckjord [Member]          
Segment Reporting Information [Line Items]          
Pretax (gain) loss on disposal       $ (106)  
Operation, maintenance and other       1  
Certain Renewable Assets [Member] | Commercial Renewables [Member]          
Segment Reporting Information [Line Items]          
Pretax proceeds from sale $ 415        
Operating Wind, Solar and Battery Storage Assets [Member] | Commercial Renewables [Member]          
Segment Reporting Information [Line Items]          
Ownership percent divested 49.00%        
Assets divested | asset 37        
Operating Solar assets [Member] | Commercial Renewables [Member]          
Segment Reporting Information [Line Items]          
Ownership percent divested 33.00%        
Assets divested | asset 11        
Renewable Merchant Plants [Member]          
Segment Reporting Information [Line Items]          
Property, plant and equipment, net   $ 160   $ 160