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Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Current maturities of long-term debt $ 3,756 $ 3,141
Other debt obligations    
Debt Instrument [Line Items]    
Current maturities of long-term debt 346  
Duke Energy Progress    
Debt Instrument [Line Items]    
Current maturities of long-term debt $ 1,006 1,006
Duke Energy Progress | Unsecured Debt | Debt maturing December 2020, floating interest rate    
Debt Instrument [Line Items]    
Interest Rate 0.986%  
Current maturities of long-term debt $ 700  
Duke Energy Progress | First Mortgage Bonds | Bonds maturing September 2020, floating interest rate    
Debt Instrument [Line Items]    
Interest Rate 0.498%  
Current maturities of long-term debt $ 300  
Progress Energy    
Debt Instrument [Line Items]    
Current maturities of long-term debt $ 1,829 1,577
Progress Energy | Unsecured Debt | Debt maturing January 2021, 4.400% interest rate    
Debt Instrument [Line Items]    
Interest Rate 4.40%  
Current maturities of long-term debt $ 500  
Duke Energy (Parent) | Unsecured Debt | Debt maturing March 2021, floating interest rate    
Debt Instrument [Line Items]    
Interest Rate 0.924%  
Current maturities of long-term debt $ 500  
Piedmont Natural Gas    
Debt Instrument [Line Items]    
Current maturities of long-term debt $ 160  
Piedmont Natural Gas | Unsecured Debt | Debt Maturing June 2021, 4.240% interest rate    
Debt Instrument [Line Items]    
Interest Rate 4.24%  
Current maturities of long-term debt $ 160  
Duke Energy Florida    
Debt Instrument [Line Items]    
Current maturities of long-term debt $ 323 571
Duke Energy Florida | Secured Debt | Debt Maturing April 2021, floating interest rate    
Debt Instrument [Line Items]    
Interest Rate 1.384%  
Current maturities of long-term debt $ 250  
Duke Energy Indiana    
Debt Instrument [Line Items]    
Current maturities of long-term debt $ 503 503
Duke Energy Indiana | First Mortgage Bonds | Bonds maturing July 2020, 3.750% interest rate    
Debt Instrument [Line Items]    
Interest Rate 3.75%  
Current maturities of long-term debt $ 500  
Duke Energy Carolinas    
Debt Instrument [Line Items]    
Current maturities of long-term debt $ 508 $ 458
Duke Energy Carolinas | First Mortgage Bonds | Bonds Maturing June 2021, 3.900% interest rate    
Debt Instrument [Line Items]    
Interest Rate 3.90%  
Current maturities of long-term debt $ 500