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Variable Interest Entities (Narrative) (Details) - USD ($)
6 Months Ended 12 Months Ended
Mar. 31, 2018
Jun. 30, 2020
Dec. 31, 2019
FES      
Variable Interest Entities [Line Items]      
Power participation ratio 4.85%    
VIE primary beneficiary      
Variable Interest Entities [Line Items]      
Variable interest entity, financial or other support, amount   $ 0 $ 0
VIE primary beneficiary | CRC      
Variable Interest Entities [Line Items]      
Percent of proceeds received as cash   75.00%  
Percent of proceeds received as subordinated note   25.00%  
Minimum equity balance required by Cinergy Receivables   $ 3,000,000  
VIE not primary beneficiary | OVEC      
Variable Interest Entities [Line Items]      
Variable interest entity ownership interest   9.00%