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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Duke Energy Carolinas | Corporate governance and shared service expenses | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | $ 753 | $ 841 | $ 985
Duke Energy Carolinas | Indemnification coverages | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 20 | 20 | 22
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 | 114 | 186 | 207
Related party transaction, other revenues from transactions with related party | 25 | 60 | 84
Duke Energy Carolinas | Intercompany natural gas transactions | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 15 | 15 | 15
Progress Energy | Corporate governance and shared service expenses | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 715 | 778 | 906
Progress Energy | Indemnification coverages | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 36 | 37 | 34
Progress Energy | Joint Dispatch Agreement (JDA) revenue | Duke Energy Carolinas |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 25 | 60 | 84
Related party transaction, other revenues from transactions with related party | 114 | 186 | 207
Progress Energy | Intercompany natural gas transactions | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 75 | 76 | 78
Duke Energy Progress | Corporate governance and shared service expenses | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 420 | 462 | 577
Duke Energy Progress | Indemnification coverages | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 17 | 15 | 13
Duke Energy Progress | Joint Dispatch Agreement (JDA) revenue | Duke Energy Carolinas |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 25 | 60 | 84
Related party transaction, other revenues from transactions with related party | 114 | 186 | 207
Duke Energy Progress | Intercompany natural gas transactions | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 75 | 76 | 78
Duke Energy Florida | Corporate governance and shared service expenses | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 295 | 316 | 329
Duke Energy Florida | Indemnification coverages | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 19 | 22 | 21
Duke Energy Ohio | Corporate governance and shared service expenses | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 326 | 354 | 374
Duke Energy Ohio | Indemnification coverages | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 4 | 4 | 5
Duke Energy Indiana | Corporate governance and shared service expenses | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 401 | 412 | 405
Duke Energy Indiana | Indemnification coverages | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 8 | 7 | 7
Piedmont | Corporate governance and shared service expenses | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 140 | 138 | 170
Piedmont | Indemnification coverages | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | 3 | 3 | 2
Piedmont | Intercompany natural gas transactions | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, other revenues from transactions with related party | 90 | 91 | 93
Piedmont | Natural gas storage and transportation costs | Affiliated entity |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, expenses from transactions with related party | $ 23 | $ 23 | $ 25

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