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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party $ 23,656 $ 22,457 $ 22,042
Duke Energy Carolinas      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 6,892 7,136 6,255
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 638 812 823
Duke Energy Carolinas | Indemnification coverages | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 54 44 34
Duke Energy Carolinas | Joint Dispatch Agreement (JDA) revenue | Duke Energy Progress      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 349 187 177
Related party transaction, other revenues from transactions with related party 119 35 34
Duke Energy Carolinas | Intercompany natural gas transactions | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 6 12 11
Progress Energy      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 10,804 10,234 10,485
Progress Energy | Corporate governance and shared service expenses | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 591 709 736
Progress Energy | Indemnification coverages | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 63 57 47
Progress Energy | Joint Dispatch Agreement (JDA) revenue | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 119 35 34
Related party transaction, other revenues from transactions with related party 349 187 177
Progress Energy | Intercompany natural gas transactions | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 76 75 75
Duke Energy Progress      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 5,553 5,316 5,041
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 342 426 434
Duke Energy Progress | Indemnification coverages | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 26 23 20
Duke Energy Progress | Joint Dispatch Agreement (JDA) revenue | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 119 35 34
Related party transaction, other revenues from transactions with related party 349 187 177
Duke Energy Progress | Intercompany natural gas transactions | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 76 75 75
Duke Energy Florida      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 5,237 4,898 5,426
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 249 283 302
Duke Energy Florida | Indemnification coverages | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 37 34 27
Duke Energy Ohio      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 2,213 1,968 1,983
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 260 304 294
Duke Energy Ohio | Indemnification coverages | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 6 6 5
Duke Energy Indiana      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 2,760 2,361 2,655
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 293 355 365
Duke Energy Indiana | Indemnification coverages | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 9 10 8
Piedmont      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 1,541 1,098 1,066
Piedmont | Corporate governance and shared service expenses | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 143 166 149
Piedmont | Indemnification coverages | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party 5 4 4
Piedmont | Intercompany natural gas transactions | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, other revenues from transactions with related party 82 87 86
Piedmont | Natural gas storage and transportation costs | Related Party      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party $ 22 $ 23 $ 24