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Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Variable Interest Entities [Line Items]    
Regulatory Assets: Current $ 1,977 $ 2,739
Current Assets: Other 984 695
Other Noncurrent Assets: Regulatory assets 14,077 14,220
Other Noncurrent Assets: Other 3,885 3,507
Current Liabilities: Other 2,044 2,080
Current maturities of long-term debt 6,452 4,349
Long-Term Debt 79,301 76,340
Inventory 4,494 4,496
Accounts payable 4,191 5,436
Duke Energy Carolinas    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 662 685
Current Assets: Other 433 52
Other Noncurrent Assets: Regulatory assets 4,239 4,199
Other Noncurrent Assets: Other 1,221 1,127
Current Liabilities: Other 546 541
Current maturities of long-term debt 26 521
Inventory 1,545 1,536
Duke Energy Progress    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 663 626
Current Assets: Other 208 104
Other Noncurrent Assets: Regulatory assets 4,412 4,555
Other Noncurrent Assets: Other 778 724
Current Liabilities: Other 326 427
Current maturities of long-term debt 85 983
Inventory 1,380 1,341
Duke Energy Florida    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 211 1,022
Current Assets: Other 57 227
Other Noncurrent Assets: Regulatory assets 2,113 2,064
Other Noncurrent Assets: Other 510 465
Current Liabilities: Other 366 342
Current maturities of long-term debt 787 534
Long-Term Debt 9,755 9,814
Inventory 771 745
DEFPF | Duke Energy Florida | VIE primary beneficiary    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 62 61
Current Assets: Other 12 35
Other Noncurrent Assets: Regulatory assets 696 741
Other Noncurrent Assets: Other 7 0
Current Liabilities: Other 2 8
Current maturities of long-term debt 61 59
Long-Term Debt 712 773
DECNCSF | Duke Energy Carolinas | VIE primary beneficiary    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 12 12
Current Assets: Other 5 9
Other Noncurrent Assets: Regulatory assets 181 189
Other Noncurrent Assets: Other 1 1
Current Liabilities: Other   2
Current maturities of long-term debt 11 10
Long-Term Debt 188 198
DECNCSFII | Duke Energy Carolinas | VIE primary beneficiary    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 29  
Current Assets: Other 0  
Other Noncurrent Assets: Regulatory assets 548  
Other Noncurrent Assets: Other 3  
Current maturities of long-term debt 2  
Long-Term Debt 577  
DEPNCSF | Duke Energy Progress | VIE primary beneficiary    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 39 39
Current Assets: Other 18 27
Other Noncurrent Assets: Regulatory assets 590 620
Other Noncurrent Assets: Other 4 4
Current Liabilities: Other   10
Current maturities of long-term debt 35 34
Long-Term Debt 611 646
DEPNCSFII | Duke Energy Progress | VIE primary beneficiary    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 23  
Current Assets: Other 0  
Other Noncurrent Assets: Regulatory assets 433  
Other Noncurrent Assets: Other 2  
Current maturities of long-term debt 1  
Long-Term Debt 457  
DEPSCSF | Duke Energy Progress | VIE primary beneficiary    
Variable Interest Entities [Line Items]    
Regulatory Assets: Current 8 8
Current Assets: Other 2 13
Other Noncurrent Assets: Regulatory assets 153 155
Other Noncurrent Assets: Other 1 1
Current Liabilities: Other   7
Current maturities of long-term debt 5 9
Long-Term Debt 158 163
DEF ProCo | Duke Energy Florida | VIE primary beneficiary    
Variable Interest Entities [Line Items]    
Inventory 550 494
Accounts payable $ 266 $ 208