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Business Segments (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 06, 2019
USD ($)
asset
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Segment Reporting Information [Line Items]          
Sale of noncontrolling interest $ 465 $ (408) [1]   $ (408) [1]  
Sale of noncontrolling interest, tax benefit 8        
Pretax (gain) loss on disposal     $ (10)   $ 87
Operation, maintenance and other   1,484 1,584 4,337 4,592
Duke Energy Ohio [Member]          
Segment Reporting Information [Line Items]          
Pretax (gain) loss on disposal         106
Operation, maintenance and other   123 $ 76 $ 378 337
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]          
Net proceeds from the sales of other assets $ 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  
[1]
See Note 2 for additional discussion of the transaction.