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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Duke Energy Carolinas [Member] | Corporate Governance And Shared Service Expenses [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | $ 985 | $ 858 | $ 831 |
Duke Energy Carolinas [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 22 | 23 | 22 |
Duke Energy Carolinas [Member] | Joint Dispatch Agreement (JDA) [Member] | Duke Energy Progress [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, other revenues from transactions with related party |  |  | 84 | 49 | 38 |
Related party transaction, expenses from transactions with related party |  |  | 207 | 145 | 156 |
Duke Energy Carolinas [Member] | Intercompany Natural Gas Transactions [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 15 | 9 | 2 |
Progress Energy [Member] | Corporate Governance And Shared Service Expenses [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 906 | 736 | 710 |
Progress Energy [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 34 | 38 | 35 |
Progress Energy [Member] | Joint Dispatch Agreement (JDA) [Member] | Duke Energy Carolinas [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, other revenues from transactions with related party |  |  | 207 | 145 | 156 |
Related party transaction, expenses from transactions with related party |  |  | 84 | 49 | 38 |
Progress Energy [Member] | Intercompany Natural Gas Transactions [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 78 | 77 | 19 |
Duke Energy Progress [Member] | Corporate Governance And Shared Service Expenses [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 577 | 438 | 397 |
Duke Energy Progress [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 13 | 15 | 14 |
Duke Energy Progress [Member] | Joint Dispatch Agreement (JDA) [Member] | Duke Energy Carolinas [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, other revenues from transactions with related party |  |  | 207 | 145 | 156 |
Related party transaction, expenses from transactions with related party |  |  | 84 | 49 | 38 |
Duke Energy Progress [Member] | Intercompany Natural Gas Transactions [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 78 | 77 | 19 |
Duke Energy Florida [Member] | Corporate Governance And Shared Service Expenses [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 329 | 298 | 313 |
Duke Energy Florida [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 21 | 23 | 21 |
Duke Energy Ohio [Member] | Corporate Governance And Shared Service Expenses [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 374 | 363 | 356 |
Duke Energy Ohio [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 5 | 5 | 5 |
Duke Energy Indiana [Member] | Corporate Governance And Shared Service Expenses [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 405 | 370 | 366 |
Duke Energy Indiana [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 7 | 8 | $ 8 |
Piedmont Natural Gas [Member] | Corporate Governance And Shared Service Expenses [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 170 | 50 |  |
Piedmont Natural Gas [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 2 | 2 |  |
Piedmont Natural Gas [Member] | Intercompany Natural Gas Transactions [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, other revenues from transactions with related party | $ 7 | $ 14 |  |  |  | $ 74
Piedmont Natural Gas [Member] | Intercompany Natural Gas Transactions [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, other revenues from transactions with related party |  |  | 93 | 86 |  |
Piedmont Natural Gas [Member] | Natural Gas Storage And Transportation Costs [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  | $ 6 | $ 25 | $ 25 |  | $ 29

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