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Debt and Credit Facilities (Narrative) (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
May 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Debt issuances     $ 6,210,000,000   $ 5,050,000,000
Demand notes, maximum amount available for sale     3,000,000,000    
Demand notes, maximum amount outstanding     1,500,000,000    
Principal amount of demand notes     1,049,000,000   1,010,000,000
Other loans outstanding against cash surrender value of life insurance policies     $ 777,000,000   741,000,000
Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization percentage, for each borrower     0.65    
June 2017 Three Year Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Size     $ 1,000,000,000    
Term of debt instrument     3 years    
Long-term line of credit     $ 500,000,000    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Size     8,000,000,000    
Duke Energy Carolinas          
Debt Instrument [Line Items]          
Debt issuances     $ 800,000,000   2,000,000,000
Duke Energy Carolinas | Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization percentage, for each borrower     0.65    
Duke Energy Carolinas | Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Size     $ 1,500,000,000    
Progress Energy | Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization percentage, for each borrower     0.65    
Duke Energy Progress          
Debt Instrument [Line Items]          
Debt issuances     $ 600,000,000   800,000,000
Other loans outstanding against cash surrender value of life insurance policies     $ 36,000,000   37,000,000
Duke Energy Progress | Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization percentage, for each borrower     0.65    
Duke Energy Progress | Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Size     $ 1,250,000,000    
Duke Energy Progress | Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Facility Size         700,000,000
Term of debt instrument     2 years    
Long-term line of credit     $ 700,000,000    
Piedmont          
Debt Instrument [Line Items]          
Debt issuances     $ 600,000,000    
Proceeds from issuance of debt   $ 600,000,000      
Piedmont | Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization percentage, for each borrower     0.70    
Piedmont | Term Loan          
Debt Instrument [Line Items]          
Repayments of debt   $ 350,000,000      
Piedmont | Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Size     $ 600,000,000    
Duke Energy Florida          
Debt Instrument [Line Items]          
Debt issuances     $ 900,000,000   $ 1,000,000,000
Duke Energy Florida | Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization percentage, for each borrower     0.65    
Duke Energy Florida | Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Size     $ 800,000,000    
Duke Energy Ohio          
Debt Instrument [Line Items]          
Debt issuances     $ 1,010,000,000    
Duke Energy Ohio | Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization percentage, for each borrower     0.65    
Duke Energy Ohio | Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Size     $ 600,000,000    
Duke Energy Indiana          
Debt Instrument [Line Items]          
Debt issuances     $ 500,000,000    
Duke Energy Indiana | Maximum          
Debt Instrument [Line Items]          
Debt to total capitalization percentage, for each borrower     0.65    
Duke Energy Indiana | Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Size     $ 600,000,000    
North Carolina Ash Basins | USDOJ | Duke Energy Carolinas | Revolving Credit Facility          
Debt Instrument [Line Items]          
Minimum master credit facility balance required     250,000,000    
North Carolina Ash Basins | USDOJ | Duke Energy Progress | Revolving Credit Facility          
Debt Instrument [Line Items]          
Minimum master credit facility balance required     $ 250,000,000    
Subsequent Event | January 2019 Debt Issuance Due August 2049 | First Mortgage          
Debt Instrument [Line Items]          
Debt issuances       $ 900,000,000  
Subsequent Event | January 2020 Debt Issuance 2.45% Due August 2049 | First Mortgage          
Debt Instrument [Line Items]          
Debt issuances       $ 500,000,000  
Interest rate       2.45%  
Subsequent Event | January 2020 Debt Issuance 3.20% Due August 2049 | First Mortgage          
Debt Instrument [Line Items]          
Debt issuances       $ 400,000,000  
Interest rate       3.20%  
Forecast | Bonds Maturing June 2020, 4.300% Coupon          
Debt Instrument [Line Items]          
Interest rate 4.30%        
Repayments of debt $ 450,000,000