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Asset Retirement Obligations (ARO by Category) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Asset Retirement Obligations [Line Items]    
Total ARO $ 10,150 $ 9,156
Less: Current portion 639 596
Total noncurrent ARO 9,511 8,560
Duke Energy Carolinas    
Asset Retirement Obligations [Line Items]    
Total ARO 3,980 4,013
Less: Current portion 253 224
Total noncurrent ARO 3,727 3,789
Progress Energy    
Asset Retirement Obligations [Line Items]    
Total ARO 4,723 4,145
Less: Current portion 227 245
Total noncurrent ARO 4,496 3,900
Duke Energy Progress    
Asset Retirement Obligations [Line Items]    
Total ARO 4,518 3,870
Less: Current portion 225 244
Total noncurrent ARO 4,293 3,626
Duke Energy Florida    
Asset Retirement Obligations [Line Items]    
Total ARO 205 275
Less: Current portion 2 1
Total noncurrent ARO 203 274
Duke Energy Ohio    
Asset Retirement Obligations [Line Items]    
Total ARO 137 136
Less: Current portion 7 6
Total noncurrent ARO 130 130
Duke Energy Indiana    
Asset Retirement Obligations [Line Items]    
Total ARO 1,278 809
Less: Current portion 152 120
Total noncurrent ARO 1,126 689
Piedmont    
Asset Retirement Obligations [Line Items]    
Total ARO 27 26
Less: Current portion 0  
Total noncurrent ARO 27 $ 26
Decommissioning of nuclear power facilities    
Asset Retirement Obligations [Line Items]    
Total ARO 4,634  
Decommissioning of nuclear power facilities | Duke Energy Carolinas    
Asset Retirement Obligations [Line Items]    
Total ARO 2,024  
Decommissioning of nuclear power facilities | Progress Energy    
Asset Retirement Obligations [Line Items]    
Total ARO 2,605  
Decommissioning of nuclear power facilities | Duke Energy Progress    
Asset Retirement Obligations [Line Items]    
Total ARO 2,483  
Decommissioning of nuclear power facilities | Duke Energy Florida    
Asset Retirement Obligations [Line Items]    
Total ARO 122  
Decommissioning of nuclear power facilities | Duke Energy Ohio    
Asset Retirement Obligations [Line Items]    
Total ARO 0  
Decommissioning of nuclear power facilities | Duke Energy Indiana    
Asset Retirement Obligations [Line Items]    
Total ARO 0  
Decommissioning of nuclear power facilities | Piedmont    
Asset Retirement Obligations [Line Items]    
Total ARO 0  
Closure of ash impoundments    
Asset Retirement Obligations [Line Items]    
Total ARO 5,240  
Closure of ash impoundments | Duke Energy Carolinas    
Asset Retirement Obligations [Line Items]    
Total ARO 1,899  
Closure of ash impoundments | Progress Energy    
Asset Retirement Obligations [Line Items]    
Total ARO 2,019  
Closure of ash impoundments | Duke Energy Progress    
Asset Retirement Obligations [Line Items]    
Total ARO 2,001  
Closure of ash impoundments | Duke Energy Florida    
Asset Retirement Obligations [Line Items]    
Total ARO 18  
Closure of ash impoundments | Duke Energy Ohio    
Asset Retirement Obligations [Line Items]    
Total ARO 72  
Closure of ash impoundments | Duke Energy Indiana    
Asset Retirement Obligations [Line Items]    
Total ARO 1,249  
Closure of ash impoundments | Piedmont    
Asset Retirement Obligations [Line Items]    
Total ARO 0  
Other    
Asset Retirement Obligations [Line Items]    
Total ARO 276  
Other | Duke Energy Carolinas    
Asset Retirement Obligations [Line Items]    
Total ARO 57  
Other | Progress Energy    
Asset Retirement Obligations [Line Items]    
Total ARO 99  
Other | Duke Energy Progress    
Asset Retirement Obligations [Line Items]    
Total ARO 34  
Other | Duke Energy Florida    
Asset Retirement Obligations [Line Items]    
Total ARO 65  
Other | Duke Energy Ohio    
Asset Retirement Obligations [Line Items]    
Total ARO 65  
Other | Duke Energy Indiana    
Asset Retirement Obligations [Line Items]    
Total ARO 29  
Other | Piedmont    
Asset Retirement Obligations [Line Items]    
Total ARO $ 27