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Variable Interest Entities (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 28, 2021
Consolidated VIEs          
Variable Interest Entity [Line Items]          
Financial support   $ 0 $ 0 $ 0  
ACP | Current Liabilities | Atlantic Coast Pipeline (ACP)          
Variable Interest Entity [Line Items]          
Guarantor obligations settled         $ 855,000,000
ACP | Non-consolidated VIEs          
Variable Interest Entity [Line Items]          
VIE Ownership interest   47.00%      
Atlantic Coast Pipeline (ACP) | Current Liabilities | Atlantic Coast Pipeline (ACP)          
Variable Interest Entity [Line Items]          
Guarantor obligations settled         $ 855,000,000
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%      
DECNCSF | Duke Energy Carolinas | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Proceeds from issuance of senior secured bonds $ 237,000,000        
VIE With Ownership In Portfolio Of Wind Projects | Non-consolidated VIEs          
Variable Interest Entity [Line Items]          
VIE Ownership interest   50.00%      
OVEC | Duke Energy Ohio | Non-consolidated VIEs          
Variable Interest Entity [Line Items]          
VIE Ownership interest   9.00%      
DEPNCSF | Duke Energy Progress | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Proceeds from issuance of senior secured bonds $ 770,000,000