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Debt and Credit Facilities (Annual Maturities) (Details) - USD ($)
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt $ 4,238,000,000   $ 3,141,000,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
2021 4,238,000,000    
2022 4,905,000,000    
2023 3,356,000,000    
2024 1,344,000,000    
2025 3,153,000,000    
Thereafter 41,983,000,000    
Total long-term debt, including current maturities 58,979,000,000    
Purchase accounting adjustments (1,300,000,000)   (1,500,000,000)
Other      
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt 478,000,000    
Purchase Accounting Adjustments      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Purchase accounting adjustments 1,346,000,000    
Progress Energy      
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt 1,426,000,000   1,577,000,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
2021 1,426,000,000    
2022 1,736,000,000    
2023 638,000,000    
2024 76,000,000    
2025 725,000,000    
Thereafter 14,802,000,000    
Total long-term debt, including current maturities $ 19,403,000,000    
Progress Energy | Unsecured Debt      
Long-term Debt, Fiscal Year Maturity [Abstract]      
Repurchase amount   $ 500,000,000  
Duke Energy (Parent) | Debt Maturing May 2021 | Unsecured Debt      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 0.721%    
Current maturities of long-term debt $ 500,000,000    
Duke Energy (Parent) | Debt Maturing September 2021 | Unsecured Debt      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 3.55%    
Current maturities of long-term debt $ 500,000,000    
Duke Energy (Parent) | Debt Maturing September 2021 1.80% | Unsecured Debt      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 1.80%    
Current maturities of long-term debt $ 750,000,000    
Piedmont      
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt 160,000,000   0
Long-term Debt, Fiscal Year Maturity [Abstract]      
2021 160,000,000    
2023 45,000,000    
2024 40,000,000    
2025 205,000,000    
Thereafter 2,350,000,000    
Total long-term debt, including current maturities $ 2,800,000,000    
Piedmont | Debt Maturing June 2021 | Unsecured Debt      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 4.24%    
Current maturities of long-term debt $ 160,000,000    
Duke Energy Florida      
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt 823,000,000   571,000,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
2021 823,000,000    
2022 78,000,000    
2023 77,000,000    
2024 66,000,000    
2025 64,000,000    
Thereafter 6,878,000,000    
Total long-term debt, including current maturities $ 7,986,000,000    
Duke Energy Florida | Debt Maturing November 2021 | Unsecured Debt      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 0.482%    
Current maturities of long-term debt $ 200,000,000    
Duke Energy Florida | Debt Maturing April 2021 | Secured Debt      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 0.972%    
Current maturities of long-term debt $ 250,000,000    
Duke Energy Florida | Debt Maturing August 2021 | First Mortgage Bonds      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 3.10%    
Current maturities of long-term debt $ 300,000,000    
Duke Energy Carolinas      
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt 506,000,000   458,000,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
2021 506,000,000    
2022 721,000,000    
2023 1,008,000,000    
2024 9,000,000    
2025 310,000,000    
Thereafter 9,745,000,000    
Total long-term debt, including current maturities $ 12,299,000,000    
Duke Energy Carolinas | Debt Maturing June 2021 | First Mortgage Bonds      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 3.90%    
Current maturities of long-term debt $ 500,000,000    
Duke Energy Progress      
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt 603,000,000   1,006,000,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
2021 603,000,000    
2022 1,208,000,000    
2023 561,000,000    
2024 10,000,000    
2025 661,000,000    
Thereafter 6,274,000,000    
Total long-term debt, including current maturities $ 9,317,000,000    
Duke Energy Progress | Debt Maturing September 2021 | First Mortgage Bonds      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 3.00%    
Current maturities of long-term debt $ 500,000,000    
Duke Energy Progress | Debt Maturing September 2021 | First Mortgage Bonds      
Current Maturities Of Long Term Debt [Abstract]      
Interest Rate 8.625%    
Current maturities of long-term debt $ 100,000,000    
Duke Energy Ohio      
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt 50,000,000    
Long-term Debt, Fiscal Year Maturity [Abstract]      
2021 50,000,000    
2023 325,000,000    
2025 270,000,000    
Thereafter 2,486,000,000    
Total long-term debt, including current maturities 3,131,000,000    
Duke Energy Indiana      
Current Maturities Of Long Term Debt [Abstract]      
Current maturities of long-term debt 70,000,000   $ 503,000,000
Long-term Debt, Fiscal Year Maturity [Abstract]      
2021 70,000,000    
2022 84,000,000    
2023 3,000,000    
2024 4,000,000    
2025 154,000,000    
Thereafter 3,818,000,000    
Total long-term debt, including current maturities $ 4,133,000,000