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Variable Interest Entities (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
FES        
Variable Interest Entity [Line Items]        
Power Purchase Participation Rate 4.85%      
Financial guarantee | ACP        
Variable Interest Entity [Line Items]        
Maximum potential amount of future payments associated with guarantees   $ 827,000,000    
Outstanding borrowings under the credit facility, percent   47.00%    
VIE        
Variable Interest Entity [Line Items]        
Financial support   $ 0 $ 0 $ 0
VIE | CRC        
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    
VIE, Not Primary Beneficiary | CRC | Duke Energy Ohio        
Variable Interest Entity [Line Items]        
Fixed interest rate added to LIBOR to compute variable rate   1.00%    
VIE, Not Primary Beneficiary | OVEC | Duke Energy Ohio        
Variable Interest Entity [Line Items]        
VIE Ownership interest   9.00%