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Business Segments (Narrative) (Details)
$ in Millions
3 Months Ended
Apr. 24, 2019
USD ($)
asset
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Pretax (gain) loss on disposal   $ 3 $ 100
Operation, maintenance and other   1,419 1,464
Duke Energy Ohio [Member]      
Segment Reporting Information [Line Items]      
Pretax (gain) loss on disposal     106
Operation, maintenance and other   $ 132 131
Number of reportable segments | segment   2  
Beckjord [Member]      
Segment Reporting Information [Line Items]      
Pretax (gain) loss on disposal     106
Operation, maintenance and other     $ 1
Subsequent Event [Member] | Certain Renewable Assets [Member] | Commercial Renewables [Member]      
Segment Reporting Information [Line Items]      
Pretax proceeds from sale $ 415    
Subsequent Event [Member] | 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    
Subsequent Event [Member] | Operating Solar assets [Member] | Commercial Renewables [Member]      
Segment Reporting Information [Line Items]      
Ownership percent divested 33.00%    
Assets divested | asset 11