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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
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 | $ 213 | $ 218 | $ 433 | $ 439
Duke Energy Carolinas [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 5 | 6 | 11 | 12
Duke Energy Carolinas [Member] | Joint Dispatch Agreement [Member] | Duke Energy Progress [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | 19 | 17 | 53 | 33
Related party transaction, expenses from transactions with related party | 19 | 21 | 73 | 52
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 | 4 | 1 | 8 | 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 | 206 | 178 | 397 | 348
Progress Energy [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 9 | 9 | 17 | 19
Progress Energy [Member] | Joint Dispatch Agreement [Member] | Duke Energy Carolinas [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | 19 | 21 | 73 | 52
Related party transaction, expenses from transactions with related party | 19 | 17 | 53 | 33
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 | 19 | 19 | 38 | 38
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 | 126 | 109 | 244 | 209
Duke Energy Progress [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 3 | 3 | 6 | 7
Duke Energy Progress [Member] | Joint Dispatch Agreement [Member] | Duke Energy Carolinas [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | 19 | 21 | 73 | 52
Related party transaction, expenses from transactions with related party | 19 | 17 | 53 | 33
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 | 19 | 19 | 38 | 38
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 | 80 | 69 | 153 | 139
Duke Energy Florida [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 6 | 6 | 11 | 12
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 | 90 | 93 | 179 | 185
Duke Energy Ohio [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 1 | 1 | 2 | 2
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 | 96 | 92 | 197 | 187
Duke Energy Indiana [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 2 | 2 | 4 | 4
Piedmont Natural Gas [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party |  |  |  | 40
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 | 40 | 9 | 76 | 14
Piedmont Natural Gas [Member] | Indemnification Coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party |  |  | 1 | $ 1
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 | $ 23 | $ 20 | $ 46 |

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