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Variable Interest Entities (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Consolidated VIEs        
Variable Interest Entity [Line Items]        
Financial support   $ 0 $ 0 $ 0
FES        
Variable Interest Entity [Line Items]        
Power Purchase Participation Rate 4.85%      
ACP | Non-consolidated VIEs        
Variable Interest Entity [Line Items]        
VIE Ownership interest   47.00%    
CRC        
Variable Interest Entity [Line Items]        
Variation in credit losses   10.00%    
Variation in discount rates   20.00%    
CRC | Consolidated VIEs        
Variable Interest Entity [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    
CRC | Duke Energy Ohio | Non-consolidated VIEs        
Variable Interest Entity [Line Items]        
Fixed interest rate added to LIBOR to compute variable rate   1.00%    
OVEC | Duke Energy Ohio | Non-consolidated VIEs        
Variable Interest Entity [Line Items]        
VIE Ownership interest   9.00%