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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party $ 6,225 $ 6,017 $ 17,829 $ 17,208
Duke Energy Carolinas        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 1,778 1,943 5,236 5,498
Duke Energy Carolinas | Corporate governance and shared service expenses | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 153 186 488 589
Duke Energy Carolinas | Indemnification coverages | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 13 11 40 33
Duke Energy Carolinas | JDA | Duke Energy Progress        
Related Party Transaction [Line Items]        
Related party transaction, other revenues from transactions with related party 12 7 102 29
Related party transaction, expenses from transactions with related party 58 48 245 141
Duke Energy Carolinas | Intercompany natural gas purchases and sales | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 1 5 5 14
Progress Energy        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 2,988 2,844 8,237 7,893
Progress Energy | Corporate governance and shared service expenses | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 145 165 436 524
Progress Energy | Indemnification coverages | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 16 13 48 42
Progress Energy | JDA | Duke Energy Carolinas        
Related Party Transaction [Line Items]        
Related party transaction, other revenues from transactions with related party 58 48 245 141
Related party transaction, expenses from transactions with related party 12 7 102 29
Progress Energy | Intercompany natural gas purchases and sales | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 19 19 57 56
Duke Energy Progress        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 1,416 1,449 4,234 4,122
Duke Energy Progress | Corporate governance and shared service expenses | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 87 104 254 318
Duke Energy Progress | Indemnification coverages | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 7 5 20 17
Duke Energy Progress | JDA | Duke Energy Carolinas        
Related Party Transaction [Line Items]        
Related party transaction, other revenues from transactions with related party 58 48 245 141
Related party transaction, expenses from transactions with related party 12 7 102 29
Duke Energy Progress | Intercompany natural gas purchases and sales | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 19 19 57 56
Duke Energy Florida        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 1,569 1,390 3,993 3,758
Duke Energy Florida | Corporate governance and shared service expenses | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 58 61 182 206
Duke Energy Florida | Indemnification coverages | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 9 8 28 25
Duke Energy Ohio        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 543 496 1,678 1,494
Duke Energy Ohio | Corporate governance and shared service expenses | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 68 74 202 228
Duke Energy Ohio | Indemnification coverages | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 1 2 4 5
Duke Energy Indiana        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 750 609 2,065 1,815
Duke Energy Indiana | Corporate governance and shared service expenses | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 80 98 224 283
Duke Energy Indiana | Indemnification coverages | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 2 2 7 7
Piedmont        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 288 220 1,061 785
Piedmont | Corporate governance and shared service expenses | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 38 40 105 121
Piedmont | Indemnification coverages | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party 1 1 4 3
Piedmont | Intercompany natural gas purchases and sales | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, other revenues from transactions with related party 20 24 62 70
Piedmont | Natural gas storage and transportation costs | Related Party        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party $ 5 $ 5 $ 16 $ 17